The family

How old is a mother if she is four times older than her daughter and 5 years ago she was even seven times older than her daughter? Today, a son is 30 years younger than a father. 7 years ago, a father was seven times older than a son. How old is a son today? How many years will a father be as old as his children together?

Correct answer:

m =  40
s =  12
x =  20

Step-by-step explanation:

m=4 d m5=7 (d5)  4dm=0 7dm=30  d=10 m=40
s=o30 o7=7 (s7)  os=30 o7s=42  o=42 s=12
o+x=(s+x)+(d+x) 42+x=(12+x)+(10+x)  x=20

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