PSLEAt first, Leah had a total of 103 red and brown balloons. 20 brown balloons burst. She then increased the number of red balloons by 90%. After that, Leah had a total of 146 balloons. How many brown balloons did she have at first?
|
Red |
Brown |
Total |
Before |
10 u |
|
103 |
Change |
+ 9 u |
- 20 |
+ 43 |
After |
19 u |
|
146 |
90100 =
910Increase in the number of balloons
= 146 - 103
= 43
9 u = 43 + 20
9 u = 63
1 u = 63 ÷ 9 = 7
Number of red balloons at first
= 10 u
= 10 x 7
= 70
Number of brown balloons at first
= 103 - 70
= 33
Answer(s): 33