During a charity drive, Primary 4 raised 6 times as much money as Primary 1 on the first week. On the second week, Primary 4 raised another $309 while Primary 1 raised another $518. During the entire charity event, Primary 4 raised 3 times as much as Primary 1. What was the total amount raised by Primary 4?
|
Primary 4 (1) |
Primary 1 (2) |
Make p the same (2) x 3 = (3) |
Before |
6 u |
1 u |
3 u |
Change |
+ 309 |
+ 518 |
+ 1554 |
After |
3 p |
1 p |
3 p |
(1) = (3)
6 u + 309 = 3 u + 1554
6 u - 3 u = 1554 - 309
3 u = 1245
1 u = 1245 ÷ 3 = 415
From (2)
1 p = 415 + 518 = 933
Total amount raised by Primary 4
= 3 p
= 3 x 933
= $2799
Answer: $2799