PSLEAt first, Leah had a total of 86 red and brown balloons. 17 brown balloons burst. She then increased the number of red balloons by 90%. After that, Leah had a total of 114 balloons. How many brown balloons did she have at first?
|
Red |
Brown |
Total |
Before |
10 u |
|
86 |
Change |
+ 9 u |
- 17 |
+ 28 |
After |
19 u |
|
114 |
90100 =
910Increase in the number of balloons
= 114 - 86
= 28
9 u = 28 + 17
9 u = 45
1 u = 45 ÷ 9 = 5
Number of red balloons at first
= 10 u
= 10 x 5
= 50
Number of brown balloons at first
= 86 - 50
= 36
Answer(s): 36