PSLE Jeremy had yellow markers and gold markers for sale. He sold 20 yellow markers. 60% of the markers sold were gold.
- How many yellow markers and gold markers did Jeremy sell altogether?
- He sold 50% of his markers. 70% of the markers left unsold were yellow. How many gold markers did Jeremy have at first?
| |
Yellow |
Gold |
Total |
Total in percent |
| Before |
5.5 u |
4.5 u |
10 u |
100% |
| Change |
- 40%
- 2 u |
- 60%
- 3 u |
- 100%
- 5 u |
- 50% |
| After |
70%
3.5 u |
30%
1.5 u |
100%
5 u |
50%
|
60% =
60100 =
35 Total number of markers sold = 5 u
Number of gold markers sold = 3 u
Number of yellow markers sold
= 5 u - 3 u
= 2 u
2 u = 20
1 u = 20 ÷ 2 = 10
Total number of markers sold
= 5 u
= 5 x 10
= 50
(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 yellow = 70%
Percent of the markers left unsold that were gold = 100% - 70% = 30%
Number of the markers left unsold that were gold
= 30% x 5 u
=
30100 x 5 u
= 1.5 u
Number of gold markers that Jeremy had at first
= 1.5 u + 3 u
= 4.5 u
= 4.5 x 10
= 45
Answer(s): (a) 50; (b) 45
