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Math problem in the fourth grade of primary school: There are 17 peacocks and deer with 56 legs. How many peacocks and deer are there?
If a peacock and a deer have four legs, then there are 17x4=68 legs.

Peacock has only two legs, 68-56= 12.

Each peacock has two more legs.

So there are 12/2=6 peacocks, 17-6= 1 1 deer.

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