Mum + Dad + Joel = 99, or x + (x-4) + ((x-4)-37) = 99. Simplify and solve 3x - 45 = 99 3x = 99 + 45 x = 33 + 15 = 48. Mum's age. ANSWER
Dad m-4 Joel (m-4)-37 Mum m TOTAL 99