PSLEAt first, Leah had a total of 126 brown and yellow balloons. 17 yellow balloons burst. She then increased the number of brown balloons by 90%. After that, Leah had a total of 190 balloons. How many yellow balloons did she have at first?
|
Brown |
Yellow |
Total |
Before |
10 u |
|
126 |
Change |
+ 9 u |
- 17 |
+ 64 |
After |
19 u |
|
190 |
90100 =
910Increase in the number of balloons
= 190 - 126
= 64
9 u = 64 + 17
9 u = 81
1 u = 81 ÷ 9 = 9
Number of brown balloons at first
= 10 u
= 10 x 9
= 90
Number of yellow balloons at first
= 126 - 90
= 36
Answer(s): 36