The ratio of Justin's money to Tommy's money is 3 : 7. If Tommy has $147, how much must he give to Justin so both will have the equal amount of money?
| |
Justin |
Tommy |
Total |
| Before |
3 u |
7 u |
10 u |
| Change |
+ 2 u |
- 2 u |
|
| After |
5 u |
5 u |
10 u |
Comparing Justin and
Tommy in the end |
1 |
1 |
|
Amount that Tommy has at first = 7 u
7 u = 147
1 u = 147 ÷ 7 = 21
Total amount that Tommy and Justin have
= 3 u + 7 u
= 10 u
Amount that each of them will have in the end
= 10 u ÷ 2
= 5 u
Amount that Tommy must give to Justin
= 5 u - 3 u
= 2 u
= 2 x 21
= $42
Answer(s): $42
