During a charity drive, Primary 4 raised 4 times as much money as Primary 3 on the first week. On the second week, Primary 4 raised another $328 while Primary 3 raised another $505. 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 |
4 u |
1 u |
2 u |
Change |
+ 328 |
+ 505 |
+ 1010 |
After |
2 p |
1 p |
2 p |
(1) = (3)
4 u + 328 = 2 u + 1010
4 u - 2 u = 1010 - 328
2 u = 682
1 u = 682 ÷ 2 = 341
From (2)
1 p = 341 + 505 = 846
Total amount raised by Primary 4
= 2 p
= 2 x 846
= $1692
Answer: $1692