The average temperature for Monday, Tuesday, Wednesday and Thursday was 48 degrees and for Tuesday, Wednesday, Thursday and Friday was 46 degrees. If the temperature on Monday was 42 degrees. Find the temperature on Friday?
- 40 degrees
- 36 degrees
- 34 degrees
- None of these
Explanation
Let's denote the temperatures:
M = Monday = 42 degrees
T = Tuesday
W = Wednesday
Th = Thursday
F = Friday
Given:
(M + T + W + Th) / 4 = 48
M + T + W + Th = 192
42 + T + W + Th = 192
T + W + Th = 150 ... (1)
(T + W + Th + F) / 4 = 46
T + W + Th + F = 184 ... (2)
Subtract (1) from (2):
(T + W + Th + F) - (T + W + Th) = 184 - 150
F = 34
The temperature on Friday was 34 degrees.
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