The ratio of Tim's money to Ahmad's money is 5 : 13. If Ahmad has $130, how much must he give to Tim so both will have the equal amount of money?
| |
Tim |
Ahmad |
Total |
| Before |
5 u |
13 u |
18 u |
| Change |
+ 4 u |
- 4 u |
|
| After |
9 u |
9 u |
18 u |
Comparing Tim and
Ahmad in the end |
1 |
1 |
|
Amount that Ahmad has at first = 13 u
13 u = 130
1 u = 130 ÷ 13 = 10
Total amount that Ahmad and Tim have
= 5 u + 13 u
= 18 u
Amount that each of them will have in the end
= 18 u ÷ 2
= 9 u
Amount that Ahmad must give to Tim
= 9 u - 5 u
= 4 u
= 4 x 10
= $40
Answer(s): $40
