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About five times
HintWork with an easy total: start with 100 people, then say what the same country looks like when it holds 200.
The whyStart with 100 people, 20 of them in towns. Fifty years later there are 200 people and 100 in towns: five times as many town dwellers, though the country itself has only doubled. That is why Manchester, Leeds and Bradford ran out of housing, clean water and sewers so quickly — the urban share and the total were climbing at once.
same next review — Easy spaces out faster after that
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