Question

Matías solved 28 math problems in 20 minutes yesterday.Using the same rate,how many math problems cans Matías solve in 90 minutes

Answer 1

To find the rate we divide the amount of problems he solved by the time it took him

`(28)/(20)=1.4\frac{\text{problems}}{\text{minute}}`

then to find the amount of problems he will solve in 90 minutes we multiply the rate by the time

`1.4\frac{problems}{\text{minute}}\cdot90\text{minutes}=126\text{problems}`

He will solve 126 problems in 90 minutes.