PSLEAt first, Leah had a total of 68 red and purple balloons. 19 purple balloons burst. She then increased the number of red balloons by 90%. After that, Leah had a total of 67 balloons. How many purple balloons did she have at first?
|
Red |
Purple |
Total |
Before |
10 u |
|
68 |
Change |
+ 9 u |
- 19 |
- 1 |
After |
19 u |
|
67 |
90100 =
910Decrease in the number of balloons
= 68 - 67
= 1
9 u = 19 - 1
9 u = 18
1 u = 18 ÷ 9 = 2
Number of red balloons at first
= 10 u
= 10 x 2
= 20
Number of purple balloons at first
= 68 - 20
= 48
Answer(s): 48