A rectangular garden has a width of 5 feet and a length of 10 feet. If an equal amount is added to both the width and the length, the area is increased to 126 square feet. What is this amount?

Respuesta :

Add 10+5, since the added amount is equal to both numbers are equal: 15
Divide 126/15: 8.4
5*8.4+10*8.4 = 126

Answer is 8.4