During a charity drive, Primary 5 raised 5 times as much money as Primary 3 on the first week. On the second week, Primary 5 raised another $302 while Primary 3 raised another $474. 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 |
5 u |
1 u |
3 u |
Change |
+ 302 |
+ 474 |
+ 1422 |
After |
3 p |
1 p |
3 p |
(1) = (3)
5 u + 302 = 3 u + 1422
5 u - 3 u = 1422 - 302
2 u = 1120
1 u = 1120 ÷ 2 = 560
From (2)
1 p = 560 + 474 = 1034
Total amount raised by Primary 5
= 3 p
= 3 x 1034
= $3102
Answer: $3102