PSLEAt first, Leah had a total of 82 purple and brown balloons. 15 brown balloons burst. She then increased the number of purple balloons by 70%. After that, Leah had a total of 102 balloons. How many brown balloons did she have at first?
|
Purple |
Brown |
Total |
Before |
10 u |
|
82 |
Change |
+ 7 u |
- 15 |
+ 20 |
After |
17 u |
|
102 |
70100 =
710Increase in the number of balloons
= 102 - 82
= 20
7 u = 20 + 15
7 u = 35
1 u = 35 ÷ 7 = 5
Number of purple balloons at first
= 10 u
= 10 x 5
= 50
Number of brown balloons at first
= 82 - 50
= 32
Answer(s): 32