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 $339 while Primary 1 raised another $471. During the entire charity event, Primary 4 raised 2 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 2 = (3) |
Before |
5 u |
1 u |
2 u |
Change |
+ 339 |
+ 471 |
+ 942 |
After |
2 p |
1 p |
2 p |
(1) = (3)
5 u + 339 = 2 u + 942
5 u - 2 u = 942 - 339
3 u = 603
1 u = 603 ÷ 3 = 201
From (2)
1 p = 201 + 471 = 672
Total amount raised by Primary 4
= 2 p
= 2 x 672
= $1344
Answer: $1344