If 'country A' has a population of 10 million and 'country B' has twice as many, what's the population of 'country B'?

A map shows 'country C' is 5 cm long. If the scale is 1 cm = 100 km, what is the actual length of 'country C'?

If 1/4 of a country's population speaks language X, what percentage speaks language X?

If a country's flag has 3 equal stripes, and each stripe is 1 meter wide, what is the total width of the stripes?

A city in 'country D' has a population of 1 million. If the country's total population is 10 million, what fraction of the country's population lives in that city?