PSLE Fred had silver markers and yellow markers for sale. He sold 150 silver markers. 40% of the markers sold were yellow.
- How many silver markers and yellow markers did Fred sell altogether?
- He sold 50% of his markers. 80% of the markers left unsold were silver. How many yellow markers did Fred have at first?
| |
Silver |
Yellow |
Total |
Total in percent |
| Before |
7 u |
3 u |
10 u |
100% |
| Change |
- 60%
- 3 u |
- 40%
- 2 u |
- 100%
- 5 u |
- 50% |
| After |
80%
4 u |
20%
1 u |
100%
5 u |
50%
|
40% =
40100 =
25 Total number of markers sold = 5 u
Number of yellow markers sold = 2 u
Number of silver markers sold
= 5 u - 2 u
= 3 u
3 u = 150
1 u = 150 ÷ 3 = 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 silver = 80%
Percent of the markers left unsold that were yellow = 100% - 80% = 20%
Number of the markers left unsold that were yellow
= 20% x 5 u
=
20100 x 5 u
= 1 u
Number of yellow markers that Fred had at first
= 1 u + 2 u
= 3 u
= 3 x 50
= 150
Answer(s): (a) 250; (b) 150
