PSLE Zeph had silver markers and blue markers for sale. He sold 210 silver markers. 40% of the markers sold were blue.
- How many silver markers and blue markers did Zeph sell altogether?
- He sold 50% of his markers. 75% of the markers left unsold were silver. How many blue markers did Zeph have at first?
| |
Silver |
Blue |
Total |
Total in percent |
| Before |
6.75 u |
3.25 u |
10 u |
100% |
| Change |
- 60%
- 3 u |
- 40%
- 2 u |
- 100%
- 5 u |
- 50% |
| After |
75%
3.75 u |
25%
1.25 u |
100%
5 u |
50%
|
40% =
40100 =
25 Total number of markers sold = 5 u
Number of blue markers sold = 2 u
Number of silver markers sold
= 5 u - 2 u
= 3 u
3 u = 210
1 u = 210 ÷ 3 = 70
Total number of markers sold
= 5 u
= 5 x 70
= 350
(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 = 75%
Percent of the markers left unsold that were blue = 100% - 75% = 25%
Number of the markers left unsold that were blue
= 25% x 5 u
=
25100 x 5 u
= 1.25 u
Number of blue markers that Zeph had at first
= 1.25 u + 2 u
= 3.25 u
= 3.25 x 70
= 227.5
Answer(s): (a) 350; (b) 227.5
