When the average age of a husband and wife and their son was 42 years and the son got married and a child was born just one year after marriage when child turned up to 5 yrs then the average age of family became 36 yrs what was the age of daughter in law at the time of marriage?
Answers
Let the age of husband, wife and son be A, B and C.
(A + B + C) / 3 = 42
A + B + C = 126 i.e. total age of all members
After 6 years combined age of
A + B + C= 126 + 18 = 144. [6 * 3 = 18]
Average age of family including daughter in law and grandson=36
Total person in family now = 5 [3 + 2 = 5]
Total age = 36 * 5 = 180
combinedly present age of daughter in law and grandson= 180 - 144 = 36
Present Age of son = 5
Present Age of daughter in law = 31 - 5 = 26.
Since they got married 6 yrs ago, her age at that time = 26 - 6 = 20 yrs old.
Answer:
Step-by-step explanation:
step1= sum of age of (H+W+S)= 42*3=126 -----1
step2= after 1+5 year
step3= sum of age of (H+W+S+S'W+C)=5*36=180------2
now the age of daughter in law at the time of marriage is
step 4= equn 1 after 6 yr
sum of age of (H+W+S+S'w+c)=126+6+6+6+6+5=155
eqution 2- eqn 1
180 -155 =25