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 $282 while Primary 3 raised another $521. 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 |
+ 282 |
+ 521 |
+ 1042 |
After |
2 p |
1 p |
2 p |
(1) = (3)
4 u + 282 = 2 u + 1042
4 u - 2 u = 1042 - 282
2 u = 760
1 u = 760 ÷ 2 = 380
From (2)
1 p = 380 + 521 = 901
Total amount raised by Primary 4
= 2 p
= 2 x 901
= $1802
Answer: $1802