PSLE Ethan had blue markers and orange markers for sale. He sold 60 blue markers. 60% of the markers sold were orange.
- How many blue markers and orange markers did Ethan sell altogether?
- He sold 50% of his markers. 60% of the markers left unsold were blue. How many orange markers did Ethan have at first?
| |
Blue |
Orange |
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 orange markers sold = 3 u
Number of blue markers sold
= 5 u - 3 u
= 2 u
2 u = 60
1 u = 60 ÷ 2 = 30
Total number of markers sold
= 5 u
= 5 x 30
= 150
(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 blue = 60%
Percent of the markers left unsold that were orange = 100% - 60% = 40%
Number of the markers left unsold that were orange
= 40% x 5 u
=
40100 x 5 u
= 2 u
Number of orange markers that Ethan had at first
= 2 u + 3 u
= 5 u
= 5 x 30
= 150
Answer(s): (a) 150; (b) 150
