During a charity drive, Primary 4 raised 4 times as much money as Primary 2 on the first week. On the second week, Primary 4 raised another $354 while Primary 2 raised another $531. 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 |
4 u |
1 u |
2 u |
Change |
+ 354 |
+ 531 |
+ 1062 |
After |
2 p |
1 p |
2 p |
(1) = (3)
4 u + 354 = 2 u + 1062
4 u - 2 u = 1062 - 354
2 u = 708
1 u = 708 ÷ 2 = 354
From (2)
1 p = 354 + 531 = 885
Total amount raised by Primary 4
= 2 p
= 2 x 885
= $1770
Answer: $1770