The ratio of Elijah's money to Bobby's money is 3 : 7. If Bobby has $84, how much must he give to Elijah so both will have the equal amount of money?
| |
Elijah |
Bobby |
Total |
| Before |
3 u |
7 u |
10 u |
| Change |
+ 2 u |
- 2 u |
|
| After |
5 u |
5 u |
10 u |
Comparing Elijah and
Bobby in the end |
1 |
1 |
|
Amount that Bobby has at first = 7 u
7 u = 84
1 u = 84 ÷ 7 = 12
Total amount that Bobby and Elijah have
= 3 u + 7 u
= 10 u
Amount that each of them will have in the end
= 10 u ÷ 2
= 5 u
Amount that Bobby must give to Elijah
= 5 u - 3 u
= 2 u
= 2 x 12
= $24
Answer(s): $24
