Gwen had 120 crayons.
23 of them were green crayons and the rest were black crayons. After she had given away some green crayons, the ratio of the number of green crayons to the number of black crayons became 3 : 5. How many crayons did she have in the end?
| |
Green |
Black |
Total |
| Before |
2x5 =
10 u |
1x5 =
5 u |
3x5 =
15 u |
| Change |
- 7 u |
|
|
| After |
3 u |
5 u |
8 u |
The number of black 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 crayons that Gwen had in the end
= 3 u + 5 u
= 8 u
= 8 x 8
= 64
Answer(s):64
