PSLEAt first, Leah had a total of 67 black and brown balloons. 10 brown balloons burst. She then increased the number of black balloons by 75%. After that, Leah had a total of 72 balloons. How many brown balloons did she have at first?
|
Black |
Brown |
Total |
Before |
4 u |
|
67 |
Change |
+ 3 u |
- 10 |
+ 5 |
After |
7 u |
|
72 |
75100 =
34Increase in the number of balloons
= 72 - 67
= 5
3 u = 5 + 10
3 u = 15
1 u = 15 ÷ 3 = 5
Number of black balloons at first
= 4 u
= 4 x 5
= 20
Number of brown balloons at first
= 67 - 20
= 47
Answer(s): 47