The ratio of Justin's money to Pierre's money is 9 : 13. If Pierre has $429, how much must he give to Justin so both will have the equal amount of money?
| |
Justin |
Pierre |
Total |
| Before |
9 u |
13 u |
22 u |
| Change |
+ 2 u |
- 2 u |
|
| After |
11 u |
11 u |
22 u |
Comparing Justin and
Pierre in the end |
1 |
1 |
|
Amount that Pierre has at first = 13 u
13 u = 429
1 u = 429 ÷ 13 = 33
Total amount that Pierre and Justin have
= 9 u + 13 u
= 22 u
Amount that each of them will have in the end
= 22 u ÷ 2
= 11 u
Amount that Pierre must give to Justin
= 11 u - 9 u
= 2 u
= 2 x 33
= $66
Answer(s): $66
