Question

Shontelle has soccer practice on Thursday evening. She has a half hour before practice to work on her math homework and talk to her friends. She has 20 math skill-work questions for homework, and she wants to complete them before talking with her friends. If she can solve three math problems in four minutes when she really focuses with no distractions, how many minutes will Shontelle have left after completing her math homework to talk to her friends.

Answer 1

3 1/3 minutes or 3 minutes 20 seconds

Explanation:

We can use ratios to see how long it will take her to complete her homework

3 problems 20 problems

----------------- = --------------

4 minutes x minutes

Using cross products

3x = 4*20

3x= 80

Divide by 3

x = 80/3

x =26 2/3 minutes

She has 30 minutes

30 -26 2/3 = 3 1/3 minutes

3 minutes 20 seconds