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Math problem in the third grade of primary school: A child weighs 25 kilograms. How many such children are equal to one ton?
1 ton = 1000 kg. If a child weighs 25 kilograms.

The equivalence relation is: child weight × number of children = one ton, that is, one ton/child weight = number of children.

So the question is:

1 ton = 1000 kg

1000 25 = 40 (piece)