PSLEAt first, Leah had a total of 54 brown and black balloons. 13 black balloons burst. She then increased the number of brown balloons by 75%. After that, Leah had a total of 47 balloons. How many black balloons did she have at first?
|
Brown |
Black |
Total |
Before |
4 u |
|
54 |
Change |
+ 3 u |
- 13 |
- 7 |
After |
7 u |
|
47 |
75100 =
34Decrease in the number of balloons
= 54 - 47
= 7
3 u = 13 - 7
3 u = 6
1 u = 6 ÷ 3 = 2
Number of brown balloons at first
= 4 u
= 4 x 2
= 8
Number of black balloons at first
= 54 - 8
= 46
Answer(s): 46