Family and age ratios

The age of father and son is in the ratio 10:3; the age of father and daughter is in the ratio 5:2. How old are father and son if the daughter is 20? In what ratio is the age of sister and brother?

Correct answer:

o =  50
s =  15
x =  4:3

Step-by-step explanation:

d=20  3o=10s 2o=5d 3o=10s 2o=5 20  3 o=10 s 2 o=5 20  3o10s=0 2o=100  Row232 Row1Row2 3o10s=0 6.67s=100  s=6.66666667100=15 o=30+10s=30+10 15=50  o=50 s=15

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