Question

10 year ago Ravi was thrice as old as Raju 5 years later Ravi will be twice as old as Raju how much how old are they

Answer 1

let Raju present age be x
then
10 yrs ago x-10
$so \: according \: to \: the \: question$
$ravi \: age \: = 3(x - 10) = 3x - 30$
5 yrs later Raju age=x+10
Ravi =2(x+10)
=2x+20
now 2x+20-15=3x-30(15 is subtracted because 15 yrs ago Ravi was 3x-30)
=> 2x+5=3x-30
30+5=3x-2x
35=x
Raju=35
so Ravi 5 yrs later =2(35+5)=80
Ravi now=80-5=75