Mr Song had $661 more than Mr Choy at first. After Mr Choy had spent $495, Mr Song had 3 times as much money as Mr Choy. Find the amount of money Mr Choy had at first.
| |
Mr Choy |
Mr Song
|
| Comparing Mr Choy and Mr Song at first |
|
$661 more |
| Before |
1 u + $495 |
3 u |
| Change |
- $495 |
|
| After |
1 u |
3 u |
After
Amount that Mr Choy has = 1 u
Amount that Mr Song has = 3 x 1 u = 3 u
Before
Amount that Mr Choy has = 1 u + 495
Amount that Mr Song has = 3 u
Mr Song had $661 more than Mr Choy at first.
If another $661 is given to Mr Choy at first, both will have the same amount at first.
3 u = 1 u + 495 + 661
3 u = 1 u + 1156
3 u - 1 u = 1156
2 u = 1156
1 u = 1156 ÷ 2 = 578
Amount that Mr Choy had at first
= 1 u + 495
= 578 + 495
= $1073
Answer(s): $1073
