Fanny had 128 pencils.
78 of them were white pencils and the rest were silver pencils. After she had given away some white pencils, the ratio of the number of white pencils to the number of silver pencils became 7 : 8. How many white pencils did she give away?
| |
White |
Silver |
Total |
| Before |
7x8 =
56 u |
1x8 =
8 u |
8x8 =
64 u |
| Change |
- 49 u |
|
|
| After |
7 u |
8 u |
15 u |
The number of silver pencils remained unchanged.
LCM of 1 and 8 = 8
Total number of pencils at first = 64 u
64 u = 128
1 u = 128 ÷ 64 = 2
Number of white pencils that she gave away
= 56 u - 7 u
= 49 u
= 49 x 2
= 98
Answer(s):98
