During a charity drive, Primary 5 raised 6 times as much money as Primary 3 on the first week. On the second week, Primary 5 raised another $243 while Primary 3 raised another $518. During the entire charity event, Primary 5 raised 3 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 3 = (3) |
Before |
6 u |
1 u |
3 u |
Change |
+ 243 |
+ 518 |
+ 1554 |
After |
3 p |
1 p |
3 p |
(1) = (3)
6 u + 243 = 3 u + 1554
6 u - 3 u = 1554 - 243
3 u = 1311
1 u = 1311 ÷ 3 = 437
From (2)
1 p = 437 + 518 = 955
Total amount raised by Primary 5
= 3 p
= 3 x 955
= $2865
Answer: $2865