PSLEAt first, Leah had a total of 73 white and black balloons. 13 black balloons burst. She then increased the number of white balloons by 75%. After that, Leah had a total of 84 balloons. How many black balloons did she have at first?
|
White |
Black |
Total |
Before |
4 u |
|
73 |
Change |
+ 3 u |
- 13 |
+ 11 |
After |
7 u |
|
84 |
75100 =
34Increase in the number of balloons
= 84 - 73
= 11
3 u = 11 + 13
3 u = 24
1 u = 24 ÷ 3 = 8
Number of white balloons at first
= 4 u
= 4 x 8
= 32
Number of black balloons at first
= 73 - 32
= 41
Answer(s): 41