She can complete 12.72≈13 problems in one hour.
Given : Kiley can complete 35 math problems in 1 1/4 hours.
To Find : No. of Problems she can complete in one hour.
Since we are given that :
Kiley can complete no. of math problems in 1 1/4 hours = 35
She can complete no. of problems in 1 hour :
Thus She can complete 12.72≈13 problems in one hour.