PSLEAt first, Leah had a total of 40 black and brown balloons. 11 brown balloons burst. She then increased the number of black balloons by 80%. After that, Leah had a total of 37 balloons. How many brown balloons did she have at first?
|
Black |
Brown |
Total |
Before |
5 u |
|
40 |
Change |
+ 4 u |
- 11 |
- 3 |
After |
9 u |
|
37 |
80100 =
45Decrease in the number of balloons
= 40 - 37
= 3
4 u = 11 - 3
4 u = 8
1 u = 8 ÷ 4 = 2
Number of black balloons at first
= 5 u
= 5 x 2
= 10
Number of brown balloons at first
= 40 - 10
= 30
Answer(s): 30