Emma had 120 pens.
910 of them were grey pens and the rest were green pens. After she had given away some grey pens, the ratio of the number of grey pens to the number of green pens became 5 : 6. How many grey pens did she give away?
|
Grey |
Green |
Total |
Before |
9x6 = 54 u |
1x6 = 6 u |
10x6 = 60 u |
Change |
- 49 u |
|
|
After |
5 u |
6 u |
11 u |
The number of green pens remained unchanged.
LCM of 1 and 6 = 6
Total number of pens at first = 60 u
60 u = 120
1 u = 120 ÷ 60 = 2
Number of grey pens that she gave away
= 54 u - 5 u
= 49 u
= 49 x 2
= 98
Answer(s):98