Eric and Jeremy had 45 files together. Jeremy had 7 less files than Eric. Both of them sold some of their files. Jeremy sold 25% more files than what Eric sold. In the end, Jeremy had half as many files left as Eric. How many files had Jeremy left?
| |
Eric
(1) |
Jeremy
(2) |
Make p the same
(2)x2 = (3) |
Comparing Eric
and Jeremy at first |
7 more |
|
|
| Before |
26 |
19 |
38 |
| Change |
- 4 u |
- 5 u |
- 10 u |
| After |
2 p |
1 p |
2 p |
Number of files that Jeremy had at first
= (45 - 7) ÷ 2
= 38 ÷ 2
= 19
Number of files that Eric had at first
= 19 + 7
= 26
Number of files that Jeremy sold in percent
= 100% + 25%
= 125%
125% =
125100 =
54 Make p the same.
(1) = (3)
26 - 4 u = 38 - 10 u
10 u - 4 u = 38 - 26
6 u = 12
1 u = 12 ÷ 6 = 2
Number of files that Jeremy had left
= 19 - 5 u
= 19 - 5 x 2
= 19 - 10
= 9
Answer(s): 9
