During a charity drive, Primary 4 raised 5 times as much money as Primary 1 on the first week. On the second week, Primary 4 raised another $310 while Primary 1 raised another $558. 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 |
5 u |
1 u |
3 u |
Change |
+ 310 |
+ 558 |
+ 1674 |
After |
3 p |
1 p |
3 p |
(1) = (3)
5 u + 310 = 3 u + 1674
5 u - 3 u = 1674 - 310
2 u = 1364
1 u = 1364 ÷ 2 = 682
From (2)
1 p = 682 + 558 = 1240
Total amount raised by Primary 4
= 3 p
= 3 x 1240
= $3720
Answer: $3720