PSLEAt first, Leah had a total of 103 blue and red balloons. 10 red balloons burst. She then increased the number of blue balloons by 90%. After that, Leah had a total of 156 balloons. How many red balloons did she have at first?
|
Blue |
Red |
Total |
Before |
10 u |
|
103 |
Change |
+ 9 u |
- 10 |
+ 53 |
After |
19 u |
|
156 |
90100 =
910Increase in the number of balloons
= 156 - 103
= 53
9 u = 53 + 10
9 u = 63
1 u = 63 ÷ 9 = 7
Number of blue balloons at first
= 10 u
= 10 x 7
= 70
Number of red balloons at first
= 103 - 70
= 33
Answer(s): 33