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The condition means that the entire population in the bus consists of 6 numerically equivalent groups of people:
1 group are men; 2 groups are women and 3 groups are children.
It does not mean nothing else.
The population of each group is
= 20 people.
So, there are 20 men; 2*20 = 40 women; and 3*20 = 60 children.