Question

Aditya is 3 years younger to his sister shamali. if the sum of their ages is 27 years, what are their present ages?

Answer 1

let the age of Aditya be 'x'
Age of her sister = (x+3)
x + (x+3) = 27
2x + 3 = 27
2x = 24
x = 12
Age of aditya = 12yrs
Age of her sister = 12+3 = 15yrs

Answer 2

Let the age of Aditya be y and shamali be x.
By condition,
x=y+3
x-y=3. …I
By second condition,
x+y=27. …II
ADDING I and II, we get
x+x+y-y=27+3
2x=30
x=15 years.
Then ,15=y+3
y=12 years.
Hence the age of aditya is 12 years and age of shamali is 15 years.