Julie had 144 crayons.
23 of them were pink crayons and the rest were blue crayons. After she had given away some pink crayons, the ratio of the number of pink crayons to the number of blue crayons became 7 : 8. How many pink crayons did she give away?
|
Pink |
Blue |
Total |
Before |
2x8 = 16 u |
1x8 = 8 u |
3x8 = 24 u |
Change |
- 9 u |
|
|
After |
7 u |
8 u |
15 u |
The number of blue crayons remained unchanged.
LCM of 1 and 8 = 8
Total number of crayons at first = 24 u
24 u = 144
1 u = 144 ÷ 24 = 6
Number of pink crayons that she gave away
= 16 u - 7 u
= 9 u
= 9 x 6
= 54
Answer(s):54