Yen had 96 pens.
23 of them were brown pens and the rest were black pens. After she had given away some brown pens, the ratio of the number of brown pens to the number of black pens became 7 : 8. How many pens did she have in the end?
| |
Brown |
Black |
Total |
| Before |
2x8 =
16 u |
1x8 =
8 u |
3x8 =
24 u |
| Change |
- 9 u |
|
|
| After |
7 u |
8 u |
15 u |
The number of black pens remained unchanged.
LCM of 1 and 8 = 8
Total number of pens at first = 24 u
24 u = 96
1 u = 96 ÷ 24 = 4
Number of pens that Yen had in the end
= 7 u + 8 u
= 15 u
= 15 x 4
= 60
Answer(s):60
