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 $234 while Primary 2 raised another $586. 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 |
+ 234 |
+ 586 |
+ 1172 |
After |
2 p |
1 p |
2 p |
(1) = (3)
4 u + 234 = 2 u + 1172
4 u - 2 u = 1172 - 234
2 u = 938
1 u = 938 ÷ 2 = 469
From (2)
1 p = 469 + 586 = 1055
Total amount raised by Primary 4
= 2 p
= 2 x 1055
= $2110
Answer: $2110