Anna had 120 crayons.
910 of them were green crayons and the rest were pink crayons. After she had given away some green crayons, the ratio of the number of green crayons to the number of pink crayons became 3 : 4. How many green crayons did she give away?
| |
Green |
Pink |
Total |
| Before |
9x4 =
36 u |
1x4 =
4 u |
10x4 =
40 u |
| Change |
- 33 u |
|
|
| After |
3 u |
4 u |
7 u |
The number of pink crayons remained unchanged.
LCM of 1 and 4 = 4
Total number of crayons at first = 40 u
40 u = 120
1 u = 120 ÷ 40 = 3
Number of green crayons that she gave away
= 36 u - 3 u
= 33 u
= 33 x 3
= 99
Answer(s):99
