Age of family

The age of father and son is in the ratio 10: 3. The age of the father and daughter is in ratio 5: 2. How old are a father and a son if the daughter is 20?

Correct result:

o =  50
s =  15


o:s=10:3 o:d=5:2 d=20  o=52 d=52 20=50
s=310 o=310 50=15   Verifying Solution:  p1=o/s=50/15=1033.3333 p2=o/d=50/20=52=2.5

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