Anyone knows the answer??

Add the ratios: 3 + 7 + 5 = 15
Divide total songs by the sum:
60 / 15 = 4
Now multiply each ratio by that:
3 x 4 = 12
7 x 4 = 28
5 x 4 = 20
Answer: trap = 12, r&b = 28, reggaeton = 20