Question

shawna does her math homework every night. last night, shawna spent 45 minutes solving 10 math problems. tonight, she needs to solve 15 math problems. if she does them at the same rate, how many minutes will shawna spend solving tonights math problems?

Explanation:

Step1: Calculate time per problem

First, find out how much time Shawna spends on each problem last night. She spent 45 minutes on 10 problems. So the time per problem $t$ is $t=\frac{45}{10} = 4.5$ minutes per problem.

Step2: Calculate time for 15 problems

Then, to find out how long she will take to solve 15 problems at the same rate, multiply the time per - problem by the number of problems. The total time $T$ is $T = 4.5\times15=67.5$ minutes.

Answer:

$67.5$