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 $242 while Primary 2 raised another $505. 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 |
+ 242 |
+ 505 |
+ 1010 |
After |
2 p |
1 p |
2 p |
(1) = (3)
6 u + 242 = 2 u + 1010
6 u - 2 u = 1010 - 242
4 u = 768
1 u = 768 ÷ 4 = 192
From (2)
1 p = 192 + 505 = 697
Total amount raised by Primary 4
= 2 p
= 2 x 697
= $1394
Answer: $1394