Percentages

The number of kids in a playground grew by 10% in thirty minutes.  If there are 77 kids in the park now, how many were there before?

• 70

• 71

• 72

What is 90% of 300

• 270

• 280

• 220

• 210

What is 110% of 50?

• 55

• 500

• 60

• It is not possible

20% of a number is 40. What is the number?

• 200

• 150

• 300

• 250

• 3

• 2.4

• 24

• 6

• 1760

• 2400

• 240

• 17600

• 63

• 630

• 483

• 48.3

• 154

• 286

• 308

• 132

• 4550

• 45500

• 4500

• 45000

• 216

• 2160

• 2656

• 2616