It took matthew 40 minuets to complete 15 at this rate how much time will it take for him to complete 45 problems

Hello James,

We Know:

He took 40 minutes to complete 15 problems.

Find:

How much time it took him to complete 45 problems.

Solution:

45 / 15 = 3

3 sets of 40 minutes...

40 x 3 = 120

He took 120 minutes (2 hours) to complete 45 problems!

Hope This Helps!

If you need anything else let me know!

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6