What is the ratio of the average (arithmetic mean) height of students in class X to the average height of students in class Y?
(1) The average height of the students in class X is 120 centimeters.
(2) The average height of the students in class X and class Y combined is 126 centimeters.
Average
This topic has expert replies
- Morgoth
- Master | Next Rank: 500 Posts
- Posts: 316
- Joined: Mon Sep 22, 2008 12:04 am
- Thanked: 36 times
- Followed by:1 members
Statement (1) & (2) alone are insufficient.
Combining (1) & (2)
avg. X = 120
A/x = 120
A = 120x
Z / (x+y) = 126
Z = 126(x+y)
A=120x
Z = 126(x+y)
unless we know the individual avg. of Y or number of students in X or Y we cannot solve this. Insufficient.
Thus, E.
OA?
Combining (1) & (2)
avg. X = 120
A/x = 120
A = 120x
Z / (x+y) = 126
Z = 126(x+y)
A=120x
Z = 126(x+y)
unless we know the individual avg. of Y or number of students in X or Y we cannot solve this. Insufficient.
Thus, E.
OA?