During a charity drive, Primary 5 raised 5 times as much money as Primary 3 on the first week. On the second week, Primary 5 raised another $329 while Primary 3 raised another $487. During the entire charity event, Primary 5 raised 2 times as much as Primary 3. What was the total amount raised by Primary 5?
|
Primary 5 (1) |
Primary 3 (2) |
Make p the same (2) x 2 = (3) |
Before |
5 u |
1 u |
2 u |
Change |
+ 329 |
+ 487 |
+ 974 |
After |
2 p |
1 p |
2 p |
(1) = (3)
5 u + 329 = 2 u + 974
5 u - 2 u = 974 - 329
3 u = 645
1 u = 645 ÷ 3 = 215
From (2)
1 p = 215 + 487 = 702
Total amount raised by Primary 5
= 2 p
= 2 x 702
= $1404
Answer: $1404