Percentage Problems and Applications

This video tutorial by Mr. Hul covers the concept of percentages, explaining the basic equation of part over whole equals percentage over 100. It provides various examples and detailed solutions to problems involving percentages, including real-world applications like calculating the percentage of students achieving certain grades or the percentage of red candies in a bag. The lesson concludes with a summary of key points.

What is the basic equation used to relate part, whole, and percent?

• whole / part = percent / 100

• percent = part * whole

• part + whole = percent

• part / whole = percent / 100

If 15 is what percent of 90, what is the unknown percentage?

• 20%

• 16.67%

• 10%

• 15%

In a class of 30 students, 20% earned an A. How many students is this?

• 7 students

• 4 students

• 6 students

• 5 students

A bag contains 300 candies, 28% of which are red. How many candies are red?

• 84 candies

• 72 candies

• 56 candies

• 90 candies

If 28% of candies are red, what percentage are not red?

• 22%

• 50%

• 28%

• 72%

How can mental math be used to find the number of non-red candies?

• By dividing the number of red candies by 2

• By subtracting the number of red candies from the total

• By adding the number of red candies to the total

• By multiplying the number of red candies by 2

If 24 balloons represent 15% of the total, how many balloons are there in total?

• 150

• 160

• 180

• 200

What is the purpose of using visual models in percentage problems?

• To make the problem more complex

• To verify the results obtained

• To confuse the students

• To avoid calculations

If 112 tickets have been made out of a planned 320, what percentage of the tickets have been produced?

• 40%

• 45%

• 35%

• 30%