Answer:
girl aged 12 years received $32
girl aged 15 years received $ 40
Explanation:
1. add ages together 12 + 15 = (27)
2. use your answer 27 , as your denominator
to those ages , and multiply them with $72

OR
girl aged 12 years old (a) 12÷27× $72
= $32
girl aged 15 years old (b) 15÷27×$72
= $40
(here's a proof $32 + $40)