Math problem of the day

Question:
The formula for conversion from temperature in degrees Fahrenheit (F) to temperature in degrees Celsius (C) is:
C = (5/9)*(F-A), where A is a constant. If C = 0 when F = 32, then what is the value of A?

Answers variants: A. 9/5   B. 32/9   C. 5   D. 32   E. 9


Correct answer: D. 32
Tutorial:

We may simply substitute 0 for C and 32 for F. Hence, 0 = (5/9)*(32-A). Dividing both sides by 5/9 leaves us with 0 = 32 - A. Thus A = 32.
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The correct answer is (D): 32

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