The length of each side of a square increases by 2.5 inches to form a new square with a perimeter of 70 inches. the length of each side of the original square was      x    inches.

The length of each side of the original square was inches

Step-by-step explanation:

Let

x------> the length side of the original square

we know that

The perimeter of a square is equal to

where

b is the length side of the square

In this problem

substitute

solve for x

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.

answer: for each 3 girls there is 2 boys . 3: 2

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