Question

if 20X+20Y=70, what is the average of X and Y?

Answer 1

Given 20x + 20y = 70

Divide each term with 20 , we get

=> x + y = 70/20

=> x + y = 7/2 ---( 1 )

average of x and y

= ( x + y )/2

= ( 7/2 )/2 [ from ( 1 ) ]

= 7/4

Therefore ,

average of x and y = 7/4

••••

Answer 2

20X+20Y=70
2X+2Y=7
DIVIDING BY 4 ON BOTH SIDES
(X+Y)/2=7/4=1.75
so average of Xand Y is 1.75