Question

Dravid was twice as old as rahul 10 year back how old is rahul today if devid will be 45 year old 15 year hance

Answer 1

Present

Rahul = x

David = y

10years back

Rahul = x - 10

Dravid = y - 10 = 2(x-10)

2x - y = 20 - 10

2x -y = 10         ...................(1)

after 15 years

Rahul = x + 15

David = y + 15 = 45

y = 30  ...................(2)

2x - 30 = 10

x = 40/2 = 20

Rahul's present age = 20years