PSLE Bryan had orange markers and purple markers for sale. He sold 90 orange markers. 70% of the markers sold were purple.
- How many orange markers and purple markers did Bryan sell altogether?
- He sold 50% of his markers. 70% of the markers left unsold were orange. How many purple markers did Bryan have at first?
| |
Orange |
Purple |
Total |
Total in percent |
| Before |
10 u |
10 u |
20 u |
100% |
| Change |
- 30%
- 3 u |
- 70%
- 7 u |
- 100%
- 10 u |
- 50% |
| After |
70%
7 u |
30%
3 u |
100%
10 u |
50%
|
70% =
70100 =
710 Total number of markers sold = 10 u
Number of purple markers sold = 7 u
Number of orange markers sold
= 10 u - 7 u
= 3 u
3 u = 90
1 u = 90 ÷ 3 = 30
Total number of markers sold
= 10 u
= 10 x 30
= 300
(b)
Percent of the markers left unsold = 100% - 50% = 50% 50% of the markers that were sold = 10 u 50% of the markers that were left unsold = 10 u Percent of the markers left unsold that were orange = 70%
Percent of the markers left unsold that were purple = 100% - 70% = 30%
Number of the markers left unsold that were purple
= 30% x 10 u
=
30100 x 10 u
= 3 u
Number of purple markers that Bryan had at first
= 3 u + 7 u
= 10 u
= 10 x 30
= 300
Answer(s): (a) 300; (b) 300
