Jade had 140 pencils.
34 of them were brown pencils and the rest were white pencils. After she had given away some brown pencils, the ratio of the number of brown pencils to the number of white pencils became 3 : 5. How many brown pencils did she give away?
| |
Brown |
White |
Total |
| Before |
3x5 =
15 u |
1x5 =
5 u |
4x5 =
20 u |
| Change |
- 12 u |
|
|
| After |
3 u |
5 u |
8 u |
The number of white pencils remained unchanged.
LCM of 1 and 5 = 5
Total number of pencils at first = 20 u
20 u = 140
1 u = 140 ÷ 20 = 7
Number of brown pencils that she gave away
= 15 u - 3 u
= 12 u
= 12 x 7
= 84
Answer(s):84
