Mr Kong had $660 more than Mr Ma at first. After Mr Ma had spent $330, Mr Kong had 3 times as much money as Mr Ma. Find the amount of money Mr Ma had at first.
| |
Mr Ma |
Mr Kong
|
| Comparing Mr Ma and Mr Kong at first |
|
$660 more |
| Before |
1 u + $330 |
3 u |
| Change |
- $330 |
|
| After |
1 u |
3 u |
After
Amount that Mr Ma has = 1 u
Amount that Mr Kong has = 3 x 1 u = 3 u
Before
Amount that Mr Ma has = 1 u + 330
Amount that Mr Kong has = 3 u
Mr Kong had $660 more than Mr Ma at first.
If another $660 is given to Mr Ma at first, both will have the same amount at first.
3 u = 1 u + 330 + 660
3 u = 1 u + 990
3 u - 1 u = 990
2 u = 990
1 u = 990 ÷ 2 = 495
Amount that Mr Ma had at first
= 1 u + 330
= 495 + 330
= $825
Answer(s): $825
