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 $378 while Primary 2 raised another $576. During the entire charity event, Primary 4 raised 2 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 2 = (3) |
Before |
5 u |
1 u |
2 u |
Change |
+ 378 |
+ 576 |
+ 1152 |
After |
2 p |
1 p |
2 p |
(1) = (3)
5 u + 378 = 2 u + 1152
5 u - 2 u = 1152 - 378
3 u = 774
1 u = 774 ÷ 3 = 258
From (2)
1 p = 258 + 576 = 834
Total amount raised by Primary 4
= 2 p
= 2 x 834
= $1668
Answer: $1668