START's reply

===> How many people live in Africa's fifth largest country?

I know that Africa's fifth largest country is Chad (source: The World Factbook 2013).

Using this information, I determined how many people live in Chad:

Chad

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Population:
11,193,452 (July 2013 est.)
country comparison to the world: 74
Data for all countries

Age structure:
0-14 years: 45.2% (male 2,565,613/female 2,494,020)
15-24 years: 20.4% (male 1,107,121/female 1,178,946)
25-54 years: 27.6% (male 1,393,498/female 1,693,233)
55-64 years: 3.9% (male 188,558/female 242,559)
65 years and over: 2.9% (male 137,590/female 192,314) (2013 est.)
population pyramid:
Data for all countries

Source: The World Factbook 2013