PSLEAt first, Leah had a total of 90 pink and blue balloons. 17 blue balloons burst. She then increased the number of pink balloons by 90%. After that, Leah had a total of 118 balloons. How many blue balloons did she have at first?
|
Pink |
Blue |
Total |
Before |
10 u |
|
90 |
Change |
+ 9 u |
- 17 |
+ 28 |
After |
19 u |
|
118 |
90100 =
910Increase in the number of balloons
= 118 - 90
= 28
9 u = 28 + 17
9 u = 45
1 u = 45 ÷ 9 = 5
Number of pink balloons at first
= 10 u
= 10 x 5
= 50
Number of blue balloons at first
= 90 - 50
= 40
Answer(s): 40