During a charity drive, Primary 4 raised 6 times as much money as Primary 2 on the first week. On the second week, Primary 4 raised another $278 while Primary 2 raised another $573. 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 |
6 u |
1 u |
2 u |
Change |
+ 278 |
+ 573 |
+ 1146 |
After |
2 p |
1 p |
2 p |
(1) = (3)
6 u + 278 = 2 u + 1146
6 u - 2 u = 1146 - 278
4 u = 868
1 u = 868 ÷ 4 = 217
From (2)
1 p = 217 + 573 = 790
Total amount raised by Primary 4
= 2 p
= 2 x 790
= $1580
Answer: $1580