PSLEAt first, Leah had a total of 74 white and red balloons. 11 red balloons burst. She then increased the number of white balloons by 75%. After that, Leah had a total of 81 balloons. How many red balloons did she have at first?
|
White |
Red |
Total |
Before |
4 u |
|
74 |
Change |
+ 3 u |
- 11 |
+ 7 |
After |
7 u |
|
81 |
75100 =
34Increase in the number of balloons
= 81 - 74
= 7
3 u = 7 + 11
3 u = 18
1 u = 18 ÷ 3 = 6
Number of white balloons at first
= 4 u
= 4 x 6
= 24
Number of red balloons at first
= 74 - 24
= 50
Answer(s): 50