Cody had 333 more erasers than Warren at first. Then Cody bought 57 more erasers. In the end, Cody has 3 times as many erasers as Warren.
- How many erasers did Warren have?
- Find the total number of erasers Cody and Warren had in the end?
| |
Cody |
Warren |
Total |
| Before |
1 u + 333 |
1 u |
|
| Change |
+ 57 |
|
|
| After |
1 u + 333 + 57 |
1 u |
4 u |
(a)
Before
Number of erasers that Cody had = 1 u + 333
Number of erasers that Warren had = 1 u
After
Number of erasers that Cody had = 1 u + 333 + 57 = 3 u
Number of erasers that Warren had = 1 u
1 u + 333 + 57 = 3u
1 u + 390 = 3 u
3 u - 1 u = 390
2 u = 390
1 u = 390 ÷ 2 = 195
(a)
Number of erasers that Warren had
= 1 u
= 195
(b)
Number of erasers that Cody and Warren had in the end
= 3 u + 1 u
= 4 u
= 4 x 195
= 780
Answer(s): (a) 195; (b) 780
