The lengths of three pieces of wood are 4.8 inches, 1.6 inches, and 5.2 inches. What should the length of the fourth piece be so their average is 3.7 inches

Answer 1

(4.8 +1.6 + 5.2 + x)/4 = 3.7

multiply each side by 4

4.8 +1.6 + 5.2 + x = 14.8

11.6 + x = 14.8

x= 3.2 inches