During a charity drive, Primary 5 raised 6 times as much money as Primary 3 on the first week. On the second week, Primary 5 raised another $387 while Primary 3 raised another $564. During the entire charity event, Primary 5 raised 3 times as much as Primary 3. What was the total amount raised by Primary 5?
|
Primary 5 (1) |
Primary 3 (2) |
Make p the same (2) x 3 = (3) |
Before |
6 u |
1 u |
3 u |
Change |
+ 387 |
+ 564 |
+ 1692 |
After |
3 p |
1 p |
3 p |
(1) = (3)
6 u + 387 = 3 u + 1692
6 u - 3 u = 1692 - 387
3 u = 1305
1 u = 1305 ÷ 3 = 435
From (2)
1 p = 435 + 564 = 999
Total amount raised by Primary 5
= 3 p
= 3 x 999
= $2997
Answer: $2997