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 $335 while Primary 3 raised another $502. During the entire charity event, Primary 4 raised 2 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 2 = (3) |
Before |
5 u |
1 u |
2 u |
Change |
+ 335 |
+ 502 |
+ 1004 |
After |
2 p |
1 p |
2 p |
(1) = (3)
5 u + 335 = 2 u + 1004
5 u - 2 u = 1004 - 335
3 u = 669
1 u = 669 ÷ 3 = 223
From (2)
1 p = 223 + 502 = 725
Total amount raised by Primary 4
= 2 p
= 2 x 725
= $1450
Answer: $1450