Lee had $140 less than Justin. If Justin spends $90 and Lee's mother gave Lee $190, Justin will have
14 as much money as Lee. How much money did Lee and Justin have?
| |
Make p the same
(1)x4 = (3) |
Lee
(1) |
Justin
(2) |
| Before |
4 u |
1 u |
1 u + 140 |
| Change |
- 360 |
- 90 |
+ 190 |
| After |
4 p |
1 p |
4 p |
Since Lee had $140 less than Justin, this means Justin had $140 more than Lee.
1 u - 90 = 1 p --- (1)
1 u + 140 + 190 = 4 p
1 u + 330 =
4 p --- (2)
Make p the same.
(1)
x4
4 u - 360 =
4 p --- (3)
(3) = (2)
4 u - 360 = 1 u + 330
4 u - 1 u = 330 + 360
3 u = 690
1 u = 690 ÷ 3 = 230
Total amount that Lee and Justin had
= 1 u + 1 u + 140
= 2 u + 140
= 2 x 230 + 140
= 460 + 140
= $600
Answer(s): $600
