During a charity drive, Primary 4 raised 5 times as much money as Primary 1 on the first week. On the second week, Primary 4 raised another $240 while Primary 1 raised another $550. During the entire charity event, Primary 4 raised 3 times as much as Primary 1. What was the total amount raised by Primary 4?
|
Primary 4 (1) |
Primary 1 (2) |
Make p the same (2) x 3 = (3) |
Before |
5 u |
1 u |
3 u |
Change |
+ 240 |
+ 550 |
+ 1650 |
After |
3 p |
1 p |
3 p |
(1) = (3)
5 u + 240 = 3 u + 1650
5 u - 3 u = 1650 - 240
2 u = 1410
1 u = 1410 ÷ 2 = 705
From (2)
1 p = 705 + 550 = 1255
Total amount raised by Primary 4
= 3 p
= 3 x 1255
= $3765
Answer: $3765