PSLEAt first, Leah had a total of 83 grey and purple balloons. 12 purple balloons burst. She then increased the number of grey balloons by 80%. After that, Leah had a total of 107 balloons. How many purple balloons did she have at first?
|
Grey |
Purple |
Total |
Before |
5 u |
|
83 |
Change |
+ 4 u |
- 12 |
+ 24 |
After |
9 u |
|
107 |
80100 =
45Increase in the number of balloons
= 107 - 83
= 24
4 u = 24 + 12
4 u = 36
1 u = 36 ÷ 4 = 9
Number of grey balloons at first
= 5 u
= 5 x 9
= 45
Number of purple balloons at first
= 83 - 45
= 38
Answer(s): 38