There are 25% more brown stamps than silver stamps in a bag. After Fred removed 40% of the brown stamps and increased the number of silver stamps by 10%, there are now 28 fewer brown stamps than silver stamps. Find the number of silver stamps at first.
|
Brown |
Silver |
Before |
5 u |
4 u |
Change |
- 2 u |
+ 0.4 u |
After |
3 u |
4.4 u |
Number of brown stamps in percentage
= 100% + 25%
= 125%
125% =
125100 =
54Number of brown stamps that Fred removed
= 40% x 5 u
=
40100 x 5 u
= 2 u
Number of silver stamps that Fred increased
= 10% x 4 u
=
10100 x 4 u
= 0.4 u
Number of brown stamps in the end
= 5 u - 2 u
= 3 u
Number of silver stamps in the end
= 4 u + 0.4 u
= 4.4 u
Number of fewer brown stamps than silver stamps in the end
= 4.4 u - 3 u
= 1.4 u
1.4 u = 28
1 u = 28 ÷ 1.4 = 20
Number of silver stamps at first
= 4 u
= 4 x 20
= 80
Answer(s): 80