PSLEAt first, Leah had a total of 57 grey and blue balloons. 17 blue balloons burst. She then increased the number of grey balloons by 80%. After that, Leah had a total of 52 balloons. How many blue balloons did she have at first?
|
Grey |
Blue |
Total |
Before |
5 u |
|
57 |
Change |
+ 4 u |
- 17 |
- 5 |
After |
9 u |
|
52 |
80100 =
45Decrease in the number of balloons
= 57 - 52
= 5
4 u = 17 - 5
4 u = 12
1 u = 12 ÷ 4 = 3
Number of grey balloons at first
= 5 u
= 5 x 3
= 15
Number of blue balloons at first
= 57 - 15
= 42
Answer(s): 42