Risa, Esther, Anna and Elyse went to buy a gift for their grandmother. They shared the cost equally among themselves. However, Elyse forgot to bring her money. So, the other 3 girls paid for the gift first. Anna paid
35 of the amount Risa and Esther paid. Esther paid $7 more than Risa. The next day, Elyse returned $11 to Anna and some money to Risa and Esther. How much did Elyse return to
- Risa?
- Esther?
|
Risa |
Esther |
Anna |
Elyse |
Total |
Comparing the amounts 3 girls paid first |
5 u
|
3 u
|
|
8 u
|
Comparing the amounts 2 girls paid first |
1 p
|
1 p + 7
|
|
|
|
Amounts that each girl paid for Elyse first |
- ? |
- ? |
- 11
|
+ 11 + ? |
|
Comparing the amounts each girl should pay |
1x2 = 2 u |
1x2 = 2 u |
1x2 = 2 u |
1x2 = 2 u |
4x2 = 8 u |
(a)
The total amount that the 4 girls paid is repeated. Make the total amount the same. LCM of 4 and 8 is 8.
Extra amount that Anna paid
= 3 u - 2 u
= 1 u
1 u = 11
Total amount that Risa and Esther paid at first
= 5 u
= 5 x 11
= $55
1 p + 1 p + 7 = 55
2 p = 55 - 7
2 p = 48
1 p = 48 ÷ 2 = 24
Amount that Elyse needed to pay Risa
= 1 p - 2 u
= 24 - 2 x 11
= 24 - 22
= $2
(b)
Amount that Elyse needed to pay Esther
= (1 p + 7) - 2 u
= (24 + 7) - 2 x 11
= 31 - 22
= $9
Answer(s): (a) $2; (b) $9