During a charity drive, Primary 5 raised 4 times as much money as Primary 3 on the first week. On the second week, Primary 5 raised another $270 while Primary 3 raised another $557. During the entire charity event, Primary 5 raised 2 times as much as Primary 3. What was the total amount raised by Primary 5?
|
Primary 5 (1) |
Primary 3 (2) |
Make p the same (2) x 2 = (3) |
Before |
4 u |
1 u |
2 u |
Change |
+ 270 |
+ 557 |
+ 1114 |
After |
2 p |
1 p |
2 p |
(1) = (3)
4 u + 270 = 2 u + 1114
4 u - 2 u = 1114 - 270
2 u = 844
1 u = 844 ÷ 2 = 422
From (2)
1 p = 422 + 557 = 979
Total amount raised by Primary 5
= 2 p
= 2 x 979
= $1958
Answer: $1958