During a charity drive, Primary 4 raised 5 times as much money as Primary 2 on the first week. On the second week, Primary 4 raised another $312 while Primary 2 raised another $572. During the entire charity event, Primary 4 raised 3 times as much as Primary 2. What was the total amount raised by Primary 4?
|
Primary 4 (1) |
Primary 2 (2) |
Make p the same (2) x 3 = (3) |
Before |
5 u |
1 u |
3 u |
Change |
+ 312 |
+ 572 |
+ 1716 |
After |
3 p |
1 p |
3 p |
(1) = (3)
5 u + 312 = 3 u + 1716
5 u - 3 u = 1716 - 312
2 u = 1404
1 u = 1404 ÷ 2 = 702
From (2)
1 p = 702 + 572 = 1274
Total amount raised by Primary 4
= 3 p
= 3 x 1274
= $3822
Answer: $3822