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WAEC Mathematics 2020 Paper

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Question : 32

Total: 48

The pie chart shows the population of men, women, and children in a city. If the population of the city is 1,800,000, how many men are in the city?

845,000
600,000
355,000
250,000

Solution:

Concept:

The fraction of the pie chart's angle for men equals the fraction of the total population they represent.

Explanation:

The total angle in a pie chart is

360^\circ

.

Men's angle

= 360^\circ - (120^\circ + 169^\circ) = 360^\circ - 289^\circ = 71^\circ

.

Thus, men make up

\frac{71}{360}

of the entire population.

Number of men

= \frac{71}{360} \times 1{,}800{,}000 = 355{,}000

.

Answer:

C.

355{,}000

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