Question

Roberto solved 6 math problems in 15 minutes. At that rate, how long will it take him to solve 15 math problems

Answer 1

Solution

For this case we have the following relationship:

6 math = 15 minutes

15 math = x minutes

Then we can create the following relationship:

$\frac{15}{6}=\frac{x}{15}$

Solving for x we got:

$x=15\cdot\frac{15}{6}=37.5\min$

Then the answer is:

37.5min