how does the answer come in question 10
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when he put postcards in piles of 5 there are 2 left,
it means he put postcards in 2 piles =10cards +2 left cards=12cards
he puts them in piles of 4 in 3 piles
4*3=12
so he have 12 postcards
it means he put postcards in 2 piles =10cards +2 left cards=12cards
he puts them in piles of 4 in 3 piles
4*3=12
so he have 12 postcards
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