Brain Teasers Quiz

A man is looking at a picture of someone. His friend asks, "Who are you looking at?" The man replies, "Brothers and sisters, I have none. But that man's father is my father's son." Who is in the picture?

• His son

• His father

• Himself

• His uncle

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DOK Level 3: Strategic Thinking

You have a 3-gallon jug and a 5-gallon jug. How can you measure exactly 4 gallons of water using these two jugs?

• Fill the 5-gallon jug and pour it into the 3-gallon jug until the 3-gallon jug is full. Then, you will have 2 gallons left in the 5-gallon jug. Empty the 3-gallon jug and pour the 2 gallons from the 5-gallon jug into the 3-gallon jug. Fill the 5-gallon jug again and pour it into the 3-gallon jug until it is full. Now you have exactly 4 gallons in the 5-gallon jug.

• Fill the 3-gallon jug and pour it into the 5-gallon jug. Fill the 3-gallon jug again and pour it into the 5-gallon jug until the 5-gallon jug is full. Now you have exactly 1 gallon left in the 3-gallon jug. Empty the 5-gallon jug and pour the 1 gallon from the 3-gallon jug into the 5-gallon jug. Fill the 3-gallon jug again and pour it into the 5-gallon jug. Now you have exactly 4 gallons in the 5-gallon jug.

• Fill the 5-gallon jug and pour it into the 3-gallon jug until the 3-gallon jug is full. Then, you will have 2 gallons left in the 5-gallon jug. Empty the 3-gallon jug and pour the 2 gallons from the 5-gallon jug into the 3-gallon jug. Fill the 5-gallon jug again and pour it into the 3-gallon jug until it is full. Now you have exactly 4 gallons in the 3-gallon jug.

• Fill the 3-gallon jug and pour it into the 5-gallon jug. Fill the 3-gallon jug again and pour it into the 5-gallon jug until the 5-gallon jug is full. Now you have exactly 1 gallon left in the 3-gallon jug. Empty the 5-gallon jug and pour the 1 gallon from the 3-gallon jug into the 5-gallon jug. Fill the 3-gallon jug again and pour it into the 5-gallon jug. Now you have exactly 4 gallons in the 3-gallon jug.

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DOK Level 3: Strategic Thinking

A farmer has 17 sheep and all but 9 die. How many are left?

• 8

• 9

• 17

• 0

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DOK Level 3: Strategic Thinking

If you have a 7-minute hourglass and an 11-minute hourglass, how can you measure exactly 15 minutes?

• Start both hourglasses at the same time. When the 7-minute hourglass runs out, flip it over. When the 11-minute hourglass runs out, flip it over. When the 7-minute hourglass runs out again, 15 minutes will have passed.

• Start both hourglasses at the same time. When the 7-minute hourglass runs out, flip it over. When the 11-minute hourglass runs out, flip it over. When the 7-minute hourglass runs out again, flip it over. When the 11-minute hourglass runs out again, 15 minutes will have passed.

• Start both hourglasses at the same time. When the 7-minute hourglass runs out, flip it over. When the 11-minute hourglass runs out, flip it over. When the 7-minute hourglass runs out again, flip it over. When the 11-minute hourglass runs out again, flip it over. When the 7-minute hourglass runs out again, 15 minutes will have passed.

• Start both hourglasses at the same time. When the 7-minute hourglass runs out, flip it over. When the 11-minute hourglass runs out, flip it over. When the 7-minute hourglass runs out again, flip it over. When the 11-minute hourglass runs out again, flip it over. When the 7-minute hourglass runs out again, flip it over. When the 11-minute hourglass runs out again, 15 minutes will have passed.

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DOK Level 3: Strategic Thinking

A man is pushing his car along a road when he comes to a hotel. He shouts, "I'm bankrupt!" Why?

• He is playing Monopoly.

• He is out of gas.

• He lost his job.

• He is moving to a new city.

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DOK Level 3: Strategic Thinking

You are in a room with three light switches. Each switch controls one of three light bulbs in another room. You can only enter the room with the light bulbs once. How can you determine which switch controls which bulb?

• Turn on the first switch and leave it on for a few minutes. Turn it off and turn on the second switch. Enter the room with the light bulbs. The bulb that is on is controlled by the second switch. The bulb that is off but warm is controlled by the first switch. The bulb that is off and cold is controlled by the third switch.

• Turn on the first switch and leave it on for a few minutes. Turn it off and turn on the third switch. Enter the room with the light bulbs. The bulb that is on is controlled by the third switch. The bulb that is off but warm is controlled by the first switch. The bulb that is off and cold is controlled by the second switch.

• Turn on the second switch and leave it on for a few minutes. Turn it off and turn on the third switch. Enter the room with the light bulbs. The bulb that is on is controlled by the third switch. The bulb that is off but warm is controlled by the second switch. The bulb that is off and cold is controlled by the first switch.

• Turn on the first switch and leave it on for a few minutes. Turn it off and turn on the second switch. Enter the room with the light bulbs. The bulb that is on is controlled by the second switch. The bulb that is off but warm is controlled by the third switch. The bulb that is off and cold is controlled by the first switch.

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DOK Level 3: Strategic Thinking

A man is trapped in a room with only two possible exits: two doors. Through the first door, there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door, there is a fire-breathing dragon. How does the man escape?

• He waits until night time and then goes through the first door.

• He fights the dragon.

• He uses a shield to protect himself from the sun.

• He digs a tunnel under the doors.

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DOK Level 3: Strategic Thinking

You have two ropes. Each rope takes exactly 1 hour to burn from one end to the other, but they do not burn at a constant rate. How can you measure exactly 45 minutes using these ropes?

• Light one rope at both ends and the other rope at one end. When the first rope burns out, 30 minutes have passed. Then, light the other end of the second rope. When the second rope burns out, 45 minutes have passed.

• Light both ropes at one end. When the first rope burns out, 30 minutes have passed. Then, light the other end of the second rope. When the second rope burns out, 45 minutes have passed.

• Light one rope at both ends and the other rope at one end. When the first rope burns out, 30 minutes have passed. Then, light the other end of the second rope. When the second rope burns out, 60 minutes have passed.

• Light both ropes at one end. When the first rope burns out, 30 minutes have passed. Then, light the other end of the second rope. When the second rope burns out, 60 minutes have passed.

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DOK Level 3: Strategic Thinking

A man is standing on one side of a river and his dog is on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

• The river was frozen.

• The dog jumped across the river.

• The dog swam across the river.

• The dog walked around the river.

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DOK Level 3: Strategic Thinking

You have a 5-liter jug and a 3-liter jug. How can you measure exactly 1 liter of water using these two jugs?

• Fill the 3-liter jug and pour it into the 5-liter jug. Fill the 3-liter jug again and pour it into the 5-liter jug until the 5-liter jug is full. Now you have exactly 1 liter left in the 3-liter jug.

• Fill the 5-liter jug and pour it into the 3-liter jug until the 3-liter jug is full. Now you have exactly 2 liters left in the 5-liter jug. Empty the 3-liter jug and pour the 2 liters from the 5-liter jug into the 3-liter jug. Fill the 5-liter jug again and pour it into the 3-liter jug until the 3-liter jug is full. Now you have exactly 1 liter left in the 5-liter jug.

• Fill the 3-liter jug and pour it into the 5-liter jug. Fill the 3-liter jug again and pour it into the 5-liter jug until the 5-liter jug is full. Now you have exactly 2 liters left in the 3-liter jug. Empty the 5-liter jug and pour the 2 liters from the 3-liter jug into the 5-liter jug. Fill the 3-liter jug again and pour it into the 5-liter jug until the 5-liter jug is full. Now you have exactly 1 liter left in the 3-liter jug.

• Fill the 5-liter jug and pour it into the 3-liter jug until the 3-liter jug is full. Now you have exactly 2 liters left in the 5-liter jug. Empty the 3-liter jug and pour the 2 liters from the 5-liter jug into the 3-liter jug. Fill the 5-liter jug again and pour it into the 3-liter jug until the 3-liter jug is full. Now you have exactly 1 liter left in the 5-liter jug.

Tags

DOK Level 3: Strategic Thinking