Quant Question Of The Day: 93
Arithmetic
Three mathematics classes X,Y and Z take an geometry test. The average of class X is 64, The average of class Y is 80 and the average score of class Z is 76 . The average score of class X and Y is 70 while the average score of class X and Z is 68. What is the ratio of number of students in the class X,Y and Z?
(A) 6:10:3
(B) 5:3:1
(C) 10:6:5
(D) 3:10:1
Average of class X = 64, Average of class Y = 80 and Average of class Z = 76
Suppose class X,Y and Z have x,y and z number of students respectively.
So, 64x+80y = 70(x+y) or, x/y = 5:3
And 64x+76z = 68(x+z) or, x/z = 2/1
Hence, x: y: z = 10:6:5
Option C
C
c
C
C
c