PSLE Michael had red markers and silver markers for sale. He sold 100 red markers. 60% of the markers sold were silver.
- How many red markers and silver markers did Michael sell altogether?
- He sold 50% of his markers. 60% of the markers left unsold were red. How many silver markers did Michael have at first?
|
Red |
Silver |
Total |
Total in percent |
Before |
5 u |
5 u |
10 u |
100% |
Change |
- 40% - 2 u |
- 60% - 3 u |
- 100% - 5 u |
- 50% |
After |
60% 3 u |
40% 2 u |
100% 5 u |
50%
|
60% =
60100 =
35 Total number of markers sold = 5 u
Number of silver markers sold = 3 u
Number of red markers sold
= 5 u - 3 u
= 2 u
2 u = 100
1 u = 100 ÷ 2 = 50
Total number of markers sold
= 5 u
= 5 x 50
= 250
(b)
Percent of the markers left unsold = 100% - 50% = 50% 50% of the markers that were sold = 5 u 50% of the markers that were left unsold = 5 u Percent of the markers left unsold that were red = 60%
Percent of the markers left unsold that were silver = 100% - 60% = 40%
Number of the markers left unsold that were silver
= 40% x 5 u
=
40100 x 5 u
= 2 u
Number of silver markers that Michael had at first
= 2 u + 3 u
= 5 u
= 5 x 50
= 250
Answer(s): (a) 250; (b) 250