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:
11,412,107 (July 2014 est.)
country comparison to the world: 77

Age structure:
0-14 years: 44.7% (male 2,588,424/female 2,515,935)
15-24 years: 20.6% (male 1,143,812/female 1,211,136)
25-54 years: 27.8% (male 1,436,018/female 1,737,901)
55-64 years: 3% (male 193,173/female 247,584)
65 years and over: 2.9% (male 140,592/female 197,532) (2014 est.)
population pyramid:

Source: The World Factbook 2013