3 boxes of 12″ =36 = 2 boxes of 18″
so shortest height at which the 2 stack will be the same height =36 inches
If A is your age:
400 - 2A = 244
2A = 400 - 244
2A = 156
A = 78
188
4x11 + 5 x 28 + 4
44 + 140 + 4
188
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