you don't have enough info, we need to know how old he was when he was twice her age, or how old she was
I think it will be a solution. Hope it help!
[ Answer ]

[ Explanation ]
- Find Area Of Rectangle That Measures 18 Feet Long And 15 Feet Wide
-----------------------------------
Area = Base · Height
Base - 15
Height - 18
- Insert Numbers Into Equation
15 · 18
15 · 18 = 270
270 
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B(5 - 2, -6 + 3, -1 + 1) = B(3, -3, 0)