PSLE Albert had orange staplers and green staplers for sale. He sold 120 orange staplers. 40% of the staplers sold were green.
- How many orange staplers and green staplers did Albert sell altogether?
- He sold 50% of his staplers. 80% of the staplers left unsold were orange. How many green staplers did Albert have at first?
|
Orange |
Green |
Total |
Total in percent |
Before |
7 u |
3 u |
10 u |
100% |
Change |
- 60% - 3 u |
- 40% - 2 u |
- 100% - 5 u |
- 50% |
After |
80% 4 u |
20% 1 u |
100% 5 u |
50%
|
40% =
40100 =
25 Total number of staplers sold = 5 u
Number of green staplers sold = 2 u
Number of orange staplers sold
= 5 u - 2 u
= 3 u
3 u = 120
1 u = 120 ÷ 3 = 40
Total number of staplers sold
= 5 u
= 5 x 40
= 200
(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 orange = 80%
Percent of the staplers left unsold that were green = 100% - 80% = 20%
Number of the staplers left unsold that were green
= 20% x 5 u
=
20100 x 5 u
= 1 u
Number of green staplers that Albert had at first
= 1 u + 2 u
= 3 u
= 3 x 40
= 120
Answer(s): (a) 200; (b) 120