Question

kashyap is 21 years old and kinshuk is 15 years younger to kashyap.after how many years will kashyap be twise as old as kinshuk

Answer 1

Let the years after which are of Kashyap be twice as old as Kinshuk
Also, Kinshuk is 15 years younger than Kashyap
Thus, age of Kinshuk= 21-15
= 6 years
According to the question,

21+x= 2(6+x)
21+x=12+2x
21-12=2x-x
9=x
Therefore, after 9 years Kashyap will be twice as old as Kinshuk