Tommy and Bobby have a total of $200. If Bobby gives Tommy $15, Tommy will have thrice as much money as Bobby. How much money has each of them at first?
- Bobby
- Tommy
|
Tommy |
Bobby |
Total |
Before |
3 u - $15 |
1 u + $15 |
$200 |
Change |
+ $15 |
- $15 |
|
After |
3 u |
1 u |
$200 |
(a)
Total amount that Tommy and Bobby have in the end
= 1 u + 3 u
= 4 u
4 u = 200
1 u = 200 ÷ 4 = 50
Amount that Bobby has at first
= 1 u + 15
= 50 + 15
= $65
(b)
Amount that Tommy has at first
= 200 - 65
= $135
Answer(s): (a) $65; (b) $135