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 $274 while Primary 3 raised another $497. 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 |
+ 274 |
+ 497 |
+ 994 |
After |
2 p |
1 p |
2 p |
(1) = (3)
5 u + 274 = 2 u + 994
5 u - 2 u = 994 - 274
3 u = 720
1 u = 720 ÷ 3 = 240
From (2)
1 p = 240 + 497 = 737
Total amount raised by Primary 5
= 2 p
= 2 x 737
= $1474
Answer: $1474