Nora had 120 markers.
45 of them were black markers and the rest were green markers. After she had given away some black markers, the ratio of the number of black markers to the number of green markers became 5 : 6. How many black markers did she give away?
|
Black |
Green |
Total |
Before |
4x6 = 24 u |
1x6 = 6 u |
5x6 = 30 u |
Change |
- 19 u |
|
|
After |
5 u |
6 u |
11 u |
The number of green markers remained unchanged.
LCM of 1 and 6 = 6
Total number of markers at first = 30 u
30 u = 120
1 u = 120 ÷ 30 = 4
Number of black markers that she gave away
= 24 u - 5 u
= 19 u
= 19 x 4
= 76
Answer(s):76