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