Question

age of tarak is x years today. his sis is 5 yrs elder to him. the sum of their age is 15. what is the sum of their ages 3 yrs ago
a)8 b)7 c)9 d)10​

Answer 1

Answer:

let the age of tarak be x.

thus, age of her sister= x+5

hence, according to the question, age of tarak+age of sister=15

this implies, x+x+5=15

=2x=15-5

2x=10

thus, x=5

so, taraks age is 5yrs. thus, sisters age will be 5+5=10 years.

3 yrs ago,

taraks age=5-3=2yrs

sister's age=10-3=7yrs

so, sum of ages=7+2=9

thus, 3 years ago, sum of their ages would have been 9 years.

so, the option c) is correct.

Hope it helps...