# Today is Lakshmi's birthday.She turned 24.Lakshmi is twice as old as Ramu was when Lakshmi was as old as Ramu now.How old is Ramu now?

let x-y be bobs age then.

hence Alice's age then=24-y which is also equal to x cuz Alice's age then=Bob's age now

and Alice's age now =2(x-y)=24

x-y=12

SO:

24-y=x

y=24-x

Substituting in other equation:

x-(24-x)=12

x=18