Tommy and Eric had 204 staplers together. Eric had 4 less staplers than Tommy. Both of them sold some of their staplers. Eric sold 10% more staplers than what Tommy sold. In the end, Eric had half as many staplers left as Tommy. How many staplers had Eric left?
| |
Tommy
(1) |
Eric
(2) |
Make p the same
(2)x2 = (3) |
Comparing Tommy
and Eric at first |
4 more |
|
|
| Before |
104 |
100 |
200 |
| Change |
- 10 u |
- 11 u |
- 22 u |
| After |
2 p |
1 p |
2 p |
Number of staplers that Eric had at first
= (204 - 4) ÷ 2
= 200 ÷ 2
= 100
Number of staplers that Tommy had at first
= 100 + 4
= 104
Number of staplers that Eric sold in percent
= 100% + 10%
= 110%
110% =
110100 =
1110 Make p the same.
(1) = (3)
104 - 10 u = 200 - 22 u
22 u - 10 u = 200 - 104
12 u = 96
1 u = 96 ÷ 12 = 8
Number of staplers that Eric had left
= 100 - 11 u
= 100 - 11 x 8
= 100 - 88
= 12
Answer(s): 12
