Ben and Caden had 81 staplers together. Caden had 3 less staplers than Ben. Both of them sold some of their staplers. Caden sold 25% more staplers than what Ben sold. In the end, Caden had half as many staplers left as Ben. How many staplers had Caden left?
| |
Ben
(1) |
Caden
(2) |
Make p the same
(2)x2 = (3) |
Comparing Ben
and Caden at first |
3 more |
|
|
| Before |
42 |
39 |
78 |
| Change |
- 4 u |
- 5 u |
- 10 u |
| After |
2 p |
1 p |
2 p |
Number of staplers that Caden had at first
= (81 - 3) ÷ 2
= 78 ÷ 2
= 39
Number of staplers that Ben had at first
= 39 + 3
= 42
Number of staplers that Caden sold in percent
= 100% + 25%
= 125%
125% =
125100 =
54 Make p the same.
(1) = (3)
42 - 4 u = 78 - 10 u
10 u - 4 u = 78 - 42
6 u = 36
1 u = 36 ÷ 6 = 6
Number of staplers that Caden had left
= 39 - 5 u
= 39 - 5 x 6
= 39 - 30
= 9
Answer(s): 9
