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WAEC Mathematics 2013 Paper

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Question : 44

Total: 48

The pie chart shows the distribution of 600 mathematics textbooks for Arts, Business, Science and Technical Classes. What percentage of the total number of textbooks belongs to science?

12 $\;\frac{1}{2}$ %
$\;\frac{205}{6}$ %
25%
$\;\frac{412}{3}$ %

Solution:

Concept:

A pie chart shows parts as sector angles, so the percentage for a sector is its angle divided by

360^\circ

, multiplied by

100\%

.

Explanation:

From the pie chart, the sector for Science is

45^\circ

.

Percentage for Science

= \frac{45^\circ}{360^\circ} \times 100\%

.

This simplifies to

\frac{1}{8} \times 100\% = 12\frac{1}{2}\%

.

Answer:

A.

12\frac{1}{2}\%

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