Jean had 120 crayons.
23 of them were blue crayons and the rest were brown crayons. After she had given away some blue crayons, the ratio of the number of blue crayons to the number of brown crayons became 3 : 5. How many blue crayons did she give away?
| |
Blue |
Brown |
Total |
| Before |
2x5 =
10 u |
1x5 =
5 u |
3x5 =
15 u |
| Change |
- 7 u |
|
|
| After |
3 u |
5 u |
8 u |
The number of brown crayons remained unchanged.
LCM of 1 and 5 = 5
Total number of crayons at first = 15 u
15 u = 120
1 u = 120 ÷ 15 = 8
Number of blue crayons that she gave away
= 10 u - 3 u
= 7 u
= 7 x 8
= 56
Answer(s):56
