Raj and David save a same amount of money.David spent $120 buying a birthday gift for her friend.In the end Raj had 3 timesas much as David.How much does raj have?

Raj's money = 3 * David's money

r = 3d

David's money = Raj's money - $120

d = r - 120

Substitute.

r = 3 * (r - 120) Distribute.

r = 3r - 360 Subtract 3r from both sides.

r - 3r = -360

-2r = -360 Divide by -2

r = -360/-2

r = 180

Raj's money = $180