Answer:
15 inches.
Explanation:
Let the length of each side of square be x
perimeter of square is given by 4*side\
Thus, perimeter of square iwh side x = 4x
Given
length of each side of a square increases by 2.5
new side length of square = x +2.5
New perimeter of the square = 4*( x +2.5) = 4x + 10
given that new perimeter = 70 inches
Thus,
4x + 10 = 70
4x = 70 - 10 = 60
x = 60/4 = 15
Thus, length of each side of original square was 15 inches.