Question

A father which is 45 years old has a son which is 25. When did the father age double the sons age 55 puncte dau coroana !!!

Answer 1

Răspuns:

When father was 40 years old

Explicație pas cu pas:

Father's age=F

Son"s age =S

F-S=45-25=20

S=F-20 (years), so, father was 20 when his son was born.

S×2=F

(F-20)×2=F, 2×F-40=F, 2×F-F=40, F=40, so father was 40 when his son was 20.