OA after a few people answer..
The average of temperatures at noontime from Monday to Friday is 50; the lowest one is 45, what is the possible maximum range of the temperatures?
A) 20
B) 25
C) 40
D) 45
E) 75
5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILS
Difficult Math Question #12
This topic has expert replies
-
800guy
- Master | Next Rank: 500 Posts
- Posts: 354
- Joined: Tue Jun 27, 2006 9:20 pm
- Thanked: 11 times
- Followed by:5 members
OA:
The answer 25 doesn't refer to a temperature, but rather to a range of temperatures.
The average of the 5 temps is: (a + b + c + d + e) / 5 = 50
One of these temps is 45: (a + b + c + d + 45) / 5 = 50
Solving for the variables: a + b + c + d = 205
In order to find the greatest range of temps, we minimize all temps but one. Remember, though, that 45 is the lowest temp possible, so: 45 + 45 + 45 + d = 205
Solving for the variable: d = 70
70 - 45 = 25
The answer 25 doesn't refer to a temperature, but rather to a range of temperatures.
The average of the 5 temps is: (a + b + c + d + e) / 5 = 50
One of these temps is 45: (a + b + c + d + 45) / 5 = 50
Solving for the variables: a + b + c + d = 205
In order to find the greatest range of temps, we minimize all temps but one. Remember, though, that 45 is the lowest temp possible, so: 45 + 45 + 45 + d = 205
Solving for the variable: d = 70
70 - 45 = 25
