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    Put a,b sequence is the number of toy animals Jerry and Ben have:

    Deduced:the legs of toy animals Jerry has is 4a;the legs of toy animals Ben has is 2b

    We have:{a−b=104a+2b=220{a−b=104a+2b=220⇔{a−b=102a+b=110⇔{a−b=102a+b=110⇒3a=120⇔a=40⇒3a=120⇔a=40

    So toy animals Jerry has is 40ngoam