Question

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:
(a) 13
(b) 26
(c) 39
(d) 12
(e) None of these

Answer 1

X = 80  x 5 + 7 + 14 + Y

       100                4

X =   ( 26 + Y)

             5

5X = 26 + Y  

 5X - Y = 26    ...........(1)

 X + Y = 26

   2

X + Y = 52      ............(2)

5X -Y + X + Y = 52 + 26

6X = 78

X = 13

Y = 52 - 13 = 39