Mr Oh had $721 more than Mr Zhang at first. After Mr Zhang had spent $422, Mr Oh had 4 times as much money as Mr Zhang. Find the amount of money Mr Zhang had at first.
| |
Mr Zhang |
Mr Oh
|
| Comparing Mr Zhang and Mr Oh at first |
|
$721 more |
| Before |
1 u + $422 |
4 u |
| Change |
- $422 |
|
| After |
1 u |
4 u |
After
Amount that Mr Zhang has = 1 u
Amount that Mr Oh has = 4 x 1 u = 4 u
Before
Amount that Mr Zhang has = 1 u + 422
Amount that Mr Oh has = 4 u
Mr Oh had $721 more than Mr Zhang at first.
If another $721 is given to Mr Zhang at first, both will have the same amount at first.
4 u = 1 u + 422 + 721
4 u = 1 u + 1143
4 u - 1 u = 1143
3 u = 1143
1 u = 1143 ÷ 3 = 381
Amount that Mr Zhang had at first
= 1 u + 422
= 381 + 422
= $803
Answer(s): $803
