Question

16. a number, x equals 80% of the average of 5, 7, 14 and a number y. If the average of x and y is 26, then value of y is:

Answer 1

Step-by-step explanation:

(5+7+14+y)*0.8/4 = x

(26+y) *0.2 =x

5.2 + 0.2y = x. (1)

(x+y)/2 = 26

x+y = 52. (2)

5.2 +0.2y = 52-y

1.2y = 46.8

y = 46.8/1.2

y = 39