PSLE Cole had red markers and purple markers for sale. He sold 700 red markers. 30% of the markers sold were purple.
- How many red markers and purple markers did Cole sell altogether?
- He sold 50% of his markers. 70% of the markers left unsold were red. How many purple markers did Cole have at first?
| |
Red |
Purple |
Total |
Total in percent |
| Before |
14 u |
6 u |
20 u |
100% |
| Change |
- 70%
- 7 u |
- 30%
- 3 u |
- 100%
- 10 u |
- 50% |
| After |
70%
7 u |
30%
3 u |
100%
10 u |
50%
|
30% =
30100 =
310 Total number of markers sold = 10 u
Number of purple markers sold = 3 u
Number of red markers sold
= 10 u - 3 u
= 7 u
7 u = 700
1 u = 700 ÷ 7 = 100
Total number of markers sold
= 10 u
= 10 x 100
= 1000
(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 red = 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 Cole had at first
= 3 u + 3 u
= 6 u
= 6 x 100
= 600
Answer(s): (a) 1000; (b) 600
