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ICSE Class 8 Answered

A man is 42 years old and his son is 12 years old. In how many years will the age of the son be half the age of the man at that time.
Asked by skparidaaul | 09 Dec, 2018, 08:58: AM
answered-by-expert Expert Answer
Present age of father = 42 years
Present age of son = 12 years
 
Let after x years Fathers age is twice of suns age.
 
after x years Fathers age = (42+x) Years
after x years Son'sage  = (12+x) Years
 
42+x=2(12+x) =24+2x
 
2x-x = 42 - 24  or  x = 18
 
Hence after 18 years, Fathers age is twice of son's age
 
Answered by Thiyagarajan K | 09 Dec, 2018, 10:06: AM

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