A box contained silver and white pens. There were 60% more silver pens than white pens. When 130 pens were removed from the box, the amount of silver pens decreased by 25% and the amount of white pens decreased 90%. How many pens were in the box in the end?
| |
Silver pens |
White pens |
Total pens |
| Before |
8 u |
5 u |
13 u |
| Change |
- 2 u |
- 4.5 u |
- 6.5 u |
| After |
6 u |
0.5 u |
6.5 u |
100% + 60% = 160%
160% =
160100 =
85Number of silver pens that were removed from the box
= 25% x 8 u
=
25100 x 8 u
= 2 u
Number of white pens that were removed from the box
= 90% x 5 u
=
90100 x 5 u
= 4.5 u
Total number of pens that were removed from the box
= 2 u + 4.5 u
= 6.5 u
6.5 u = 130
1 u = 130 ÷ 6.5 = 20
Number of pens in the box in the end
= 6 u + 0.5
= 6.5 u
= 6.5 x 20
= 130
Answer(s): 130
