The problem is easily solved with a system formed by three equations with three variables.
We will call the number of wigs X.
Y will be the number of her kids.
Z will be the exact number of her grandchildren.
She said that the sum of these three numbers was 19. Thus:
X + Y + Z = 19 (A)
We know that the number X, the number of wigs, was equal to twice as much as the number of grandchildren less 1.
Thus:
Thus:
X = 2(Z-1) (B)
The number of grandchildren is twice as much as the number of kids:
Z = 2Y (C)
Solving this system, formed by A, B and C, we find out that
X = 10 Y = 3 Z = 6
Back to the problem
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