PSLEAt first, Leah had a total of 62 brown and blue balloons. 20 blue balloons burst. She then increased the number of brown balloons by 80%. After that, Leah had a total of 58 balloons. How many blue balloons did she have at first?
|
Brown |
Blue |
Total |
Before |
5 u |
|
62 |
Change |
+ 4 u |
- 20 |
- 4 |
After |
9 u |
|
58 |
80100 =
45Decrease in the number of balloons
= 62 - 58
= 4
4 u = 20 - 4
4 u = 16
1 u = 16 ÷ 4 = 4
Number of brown balloons at first
= 5 u
= 5 x 4
= 20
Number of blue balloons at first
= 62 - 20
= 42
Answer(s): 42