If the average of z and x is 35, and the average of x and y is Then z – y = ?
সমাধান
সঠিক উত্তর: Option C
(z + x)/2 = 35
z + x = 70 .................... (1)
And,
(x + y)/2 = 25
x + y = 50 ................. (2)
(1) - (2), we get,
z - y = 70 -50 = 20
