Diana, Joelle, Abi and Jade went to buy a souvenir for their auntie. They shared the cost equally among themselves. However, Jade forgot to bring her money. So, the other 3 girls paid for the souvenir first. Abi paid
79 of the amount Diana and Joelle paid. Joelle paid $10 more than Diana. The next day, Jade returned $36 to Abi and some money to Diana and Joelle. How much did Jade return to
- Diana?
- Joelle?
|
Diana |
Joelle |
Abi |
Jade |
Total |
Comparing the amounts 3 girls paid first |
9 u
|
7 u
|
|
16 u
|
Comparing the amounts 2 girls paid first |
1 p
|
1 p + 10
|
|
|
|
Amounts that each girl paid for Jade first |
- ? |
- ? |
- 36
|
+ 36 + ? |
|
Comparing the amounts each girl should pay |
1x4 = 4 u |
1x4 = 4 u |
1x4 = 4 u |
1x4 = 4 u |
4x4 = 16 u |
(a)
The total amount that the 4 girls paid is repeated. Make the total amount the same. LCM of 4 and 16 is 16.
Extra amount that Abi paid
= 7 u - 4 u
= 3 u
3 u = 36
1 u = 36 ÷ 3 = 12
Total amount that Diana and Joelle paid at first
= 9 u
= 9 x 12
= $108
1 p + 1 p + 10 = 108
2 p = 108 - 10
2 p = 98
1 p = 98 ÷ 2 = 49
Amount that Jade needed to pay Diana
= 1 p - 4 u
= 49 - 4 x 12
= 49 - 48
= $1
(b)
Amount that Jade needed to pay Joelle
= (1 p + 10) - 4 u
= (49 + 10) - 4 x 12
= 59 - 48
= $11
Answer(s): (a) $1; (b) $11