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 $222 while Primary 3 raised another $520. 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 |
+ 222 |
+ 520 |
+ 1560 |
After |
3 p |
1 p |
3 p |
(1) = (3)
5 u + 222 = 3 u + 1560
5 u - 3 u = 1560 - 222
2 u = 1338
1 u = 1338 ÷ 2 = 669
From (2)
1 p = 669 + 520 = 1189
Total amount raised by Primary 4
= 3 p
= 3 x 1189
= $3567
Answer: $3567