vivekanand H s SCHOOL
posted by shankar .
the difference of ages between 2 sisters is 10 years, 15 years ago elder 1 was twice as old as younger age. find the both present age?

ba=10
(b15) = 2(a15)
(a+1015) = 2(a15)
a5 = 2a30
a = 25
So, the sisters are 25 and 35
check:
15 years ago they were 10 and 20