Min had 125 pencils.
45 of them were blue pencils and the rest were black pencils. After she had given away some blue pencils, the ratio of the number of blue pencils to the number of black pencils became 3 : 5. How many pencils did she have in the end?
| |
Blue |
Black |
Total |
| Before |
4x5 =
20 u |
1x5 =
5 u |
5x5 =
25 u |
| Change |
- 17 u |
|
|
| After |
3 u |
5 u |
8 u |
The number of black pencils remained unchanged.
LCM of 1 and 5 = 5
Total number of pencils at first = 25 u
25 u = 125
1 u = 125 ÷ 25 = 5
Number of pencils that Min had in the end
= 3 u + 5 u
= 8 u
= 8 x 5
= 40
Answer(s):40
