The average age of a couple and their son was 40 years, the son got married and a child was born just two years after their marriage. When child turned to 10 years, then the average age of the family becomes 38 years. What was the age of the daughter in law at the time of marriage ?
A) 12 years B) 10 years C) 14 years D) 13 years
Answers
Answer:
A) 12 years
Step-by-step explanation:
Given the average age of couple and their son = 40
Given the average age of couple and their son = 40=> Sum of age (H +W +S) = 40×3
Given the average age of couple and their son = 40=> Sum of age (H +W +S) = 40×3Let the age of daughter in law at the time of marriage = D years
Given the average age of couple and their son = 40=> Sum of age (H +W +S) = 40×3Let the age of daughter in law at the time of marriage = D yearsNow after 10 years,
Given the average age of couple and their son = 40=> Sum of age (H +W +S) = 40×3Let the age of daughter in law at the time of marriage = D yearsNow after 10 years,(H + S +W) + 3×12 + D +12 + 10 = 38×5
Given the average age of couple and their son = 40=> Sum of age (H +W +S) = 40×3Let the age of daughter in law at the time of marriage = D yearsNow after 10 years,(H + S +W) + 3×12 + D +12 + 10 = 38×5178 + D = 190
Given the average age of couple and their son = 40=> Sum of age (H +W +S) = 40×3Let the age of daughter in law at the time of marriage = D yearsNow after 10 years,(H + S +W) + 3×12 + D +12 + 10 = 38×5178 + D = 190D = 190 -178 = 12 years
The average age of a husband-wife and their son was 42 years. The son got married and exactly after 1 year a child was born to them. When the child became 5 years old, the average age of the family became 36 years.