Question

A is 25%older than B. by what percent is B younger thanA?

Answer 1

Let B's age=100 yrs,

then A's age=125 yrs,

therefore B is younger than A by (125-100)/125×100=25/125×100=20%

Answer 2

let b=100x
a=125x
at 125x age b is younger than 25x
100--------------------------------------=25x/125x×100
=20%


ans is 20%