Question

The ratio of rock music to total CDs that Ella owns is

25
40
. Paolo has 50 rock music CDs. The ratio of rock music to total CDs in his collection is equivalent to the ratio of rock music to total CDs in Ella’s collection. How many CDs do they own?




A 120
B 130
C 65
D 80

Answer 1

D. 80

when you write the proportion (attached) you don't even need to solve because you see that 50/25 = 2, so 40 * 2 must be the answer. (80)