During a charity drive, Primary 4 raised 4 times as much money as Primary 1 on the first week. On the second week, Primary 4 raised another $210 while Primary 1 raised another $491. 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 |
4 u |
1 u |
2 u |
Change |
+ 210 |
+ 491 |
+ 982 |
After |
2 p |
1 p |
2 p |
(1) = (3)
4 u + 210 = 2 u + 982
4 u - 2 u = 982 - 210
2 u = 772
1 u = 772 ÷ 2 = 386
From (2)
1 p = 386 + 491 = 877
Total amount raised by Primary 4
= 2 p
= 2 x 877
= $1754
Answer: $1754