PSLE Luis had green staplers and red staplers for sale. He sold 270 green staplers. 40% of the staplers sold were red.
- How many green staplers and red staplers did Luis sell altogether?
- He sold 50% of his staplers. 60% of the staplers left unsold were green. How many red staplers did Luis have at first?
| |
Green |
Red |
Total |
Total in percent |
| Before |
6 u |
4 u |
10 u |
100% |
| Change |
- 60%
- 3 u |
- 40%
- 2 u |
- 100%
- 5 u |
- 50% |
| After |
60%
3 u |
40%
2 u |
100%
5 u |
50%
|
40% =
40100 =
25 Total number of staplers sold = 5 u
Number of red staplers sold = 2 u
Number of green staplers sold
= 5 u - 2 u
= 3 u
3 u = 270
1 u = 270 ÷ 3 = 90
Total number of staplers sold
= 5 u
= 5 x 90
= 450
(b)
Percent of the staplers left unsold = 100% - 50% = 50% 50% of the staplers that were sold = 5 u 50% of the staplers that were left unsold = 5 u Percent of the staplers left unsold that were green = 60%
Percent of the staplers left unsold that were red = 100% - 60% = 40%
Number of the staplers left unsold that were red
= 40% x 5 u
=
40100 x 5 u
= 2 u
Number of red staplers that Luis had at first
= 2 u + 2 u
= 4 u
= 4 x 90
= 360
Answer(s): (a) 450; (b) 360
