Q)Arun's present age in yr is 40% of Barun's.In another few yrs, Arun's age would be half of Barun's.By wt %tage, will Barun's age incraese in this period?

20%

thanks Harshaditya, but can u kindly share the step as I got the 1st eq(ie 5A=2B) but in the 2nd eq,there is another variable ie of time too so on substitution from Eq 1 ie B=2.5A in Eq 2 isn't helpful. Hence, kindly share the eq's formed.