5th grade

A group of goats and ducks have a total of 99 heads and legs among them. There are twice as many ducks as there are goats. How many are there of each?

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  1. 5G + 3D = 99
    2G = D

    5G + 6G = 11 G = 99
    G = 9 (the number of goats)
    D = 18 (the number of ducks)

    I used algebra. Without using algebra, you'd have to try different numbers for G, double the number for D, and see what works.

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