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WAEC Mathematics 2018 Paper

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Question : 8

Total: 50

If F =

\;\frac{9}{5}

C + 32, find C when F = 98.6

30
37
39
41

Solution:

Concept:

Rearrange the temperature conversion formula to solve for

C

.

Explanation:

Given

F = \frac{9}{5}C + 32

.

Substitute

F = 98.6

into the equation.

98.6 = \frac{9}{5}C + 32

.

Subtract

32

from both sides:

98.6 - 32 = \frac{9}{5}C

.

So

66.6 = \frac{9}{5}C

.

Multiply both sides by

5

:

66.6 \times 5 = 9C

.

333 = 9C

.

Divide both sides by

9

:

C = \frac{333}{9} = 37

.

Answer:

C = 37

, so option B is correct.

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