During a charity drive, Primary 4 raised 5 times as much money as Primary 3 on the first week. On the second week, Primary 4 raised another $225 while Primary 3 raised another $543. During the entire charity event, Primary 4 raised 3 times as much as Primary 3. What was the total amount raised by Primary 4?
|
Primary 4 (1) |
Primary 3 (2) |
Make p the same (2) x 3 = (3) |
Before |
5 u |
1 u |
3 u |
Change |
+ 225 |
+ 543 |
+ 1629 |
After |
3 p |
1 p |
3 p |
(1) = (3)
5 u + 225 = 3 u + 1629
5 u - 3 u = 1629 - 225
2 u = 1404
1 u = 1404 ÷ 2 = 702
From (2)
1 p = 702 + 543 = 1245
Total amount raised by Primary 4
= 3 p
= 3 x 1245
= $3735
Answer: $3735