PSLE Cody had pink pencils and orange pencils for sale. He sold 360 pink pencils. 40% of the pencils sold were orange.
- How many pink pencils and orange pencils did Cody sell altogether?
- He sold 50% of his pencils. 75% of the pencils left unsold were pink. How many orange pencils did Cody have at first?
| |
Pink |
Orange |
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 pencils sold = 5 u
Number of orange pencils sold = 2 u
Number of pink pencils sold
= 5 u - 2 u
= 3 u
3 u = 360
1 u = 360 ÷ 3 = 120
Total number of pencils sold
= 5 u
= 5 x 120
= 600
(b)
Percent of the pencils left unsold = 100% - 50% = 50% 50% of the pencils that were sold = 5 u 50% of the pencils that were left unsold = 5 u Percent of the pencils left unsold that were pink = 75%
Percent of the pencils left unsold that were orange = 100% - 75% = 25%
Number of the pencils left unsold that were orange
= 25% x 5 u
=
25100 x 5 u
= 1.25 u
Number of orange pencils that Cody had at first
= 1.25 u + 2 u
= 3.25 u
= 3.25 x 120
= 390
Answer(s): (a) 600; (b) 390
