quadruple
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970.
4*(2x + 8) = 32
The difference between a number x and twice y is equal to fifteen.
This would depend on how old she was when he was born. For example if she was one year old when he was born, then at two years old she would be twice his age, If she was four at his birth, then when she is eight she will be twice his age. (See the related question which was the actual exercise.)
4