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 $310 while Primary 3 raised another $590. 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 |
5 u |
1 u |
2 u |
Change |
+ 310 |
+ 590 |
+ 1180 |
After |
2 p |
1 p |
2 p |
(1) = (3)
5 u + 310 = 2 u + 1180
5 u - 2 u = 1180 - 310
3 u = 870
1 u = 870 ÷ 3 = 290
From (2)
1 p = 290 + 590 = 880
Total amount raised by Primary 5
= 2 p
= 2 x 880
= $1760
Answer: $1760