PSLE Archie had blue staplers and pink staplers for sale. He sold 30 blue staplers. 40% of the staplers sold were pink.
- How many blue staplers and pink staplers did Archie sell altogether?
- He sold 50% of his staplers. 75% of the staplers left unsold were blue. How many pink staplers did Archie have at first?
| |
Blue |
Pink |
Total |
Total in percent |
| Before |
6.75 u |
3.25 u |
10 u |
100% |
| Change |
- 60%
- 3 u |
- 40%
- 2 u |
- 100%
- 5 u |
- 50% |
| After |
75%
3.75 u |
25%
1.25 u |
100%
5 u |
50%
|
40% =
40100 =
25 Total number of staplers sold = 5 u
Number of pink staplers sold = 2 u
Number of blue staplers sold
= 5 u - 2 u
= 3 u
3 u = 30
1 u = 30 ÷ 3 = 10
Total number of staplers sold
= 5 u
= 5 x 10
= 50
(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 blue = 75%
Percent of the staplers left unsold that were pink = 100% - 75% = 25%
Number of the staplers left unsold that were pink
= 25% x 5 u
=
25100 x 5 u
= 1.25 u
Number of pink staplers that Archie had at first
= 1.25 u + 2 u
= 3.25 u
= 3.25 x 10
= 32.5
Answer(s): (a) 50; (b) 32.5
