Ivan and Simon had 79 staplers together. Simon had 5 less staplers than Ivan. Both of them sold some of their staplers. Simon sold 30% more staplers than what Ivan sold. In the end, Simon had half as many staplers left as Ivan. How many staplers had Simon left?
| |
Ivan
(1) |
Simon
(2) |
Make p the same
(2)x2 = (3) |
Comparing Ivan
and Simon at first |
5 more |
|
|
| Before |
42 |
37 |
74 |
| Change |
- 10 u |
- 13 u |
- 26 u |
| After |
2 p |
1 p |
2 p |
Number of staplers that Simon had at first
= (79 - 5) ÷ 2
= 74 ÷ 2
= 37
Number of staplers that Ivan had at first
= 37 + 5
= 42
Number of staplers that Simon sold in percent
= 100% + 30%
= 130%
130% =
130100 =
1310 Make p the same.
(1) = (3)
42 - 10 u = 74 - 26 u
26 u - 10 u = 74 - 42
16 u = 32
1 u = 32 ÷ 16 = 2
Number of staplers that Simon had left
= 37 - 13 u
= 37 - 13 x 2
= 37 - 26
= 11
Answer(s): 11
