Susan has a collection of 77 nickels and dimes. If the number of nickels is six times the number of dimes, how many nickels and how many dimes does she have?

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

a

step-by-step explanation:

the answer is 62.8 cubic units