PSLEAt first, Leah had a total of 127 brown and grey balloons. 15 grey balloons burst. She then increased the number of brown balloons by 70%. After that, Leah had a total of 168 balloons. How many grey balloons did she have at first?
|
Brown |
Grey |
Total |
Before |
10 u |
|
127 |
Change |
+ 7 u |
- 15 |
+ 41 |
After |
17 u |
|
168 |
70100 =
710Increase in the number of balloons
= 168 - 127
= 41
7 u = 41 + 15
7 u = 56
1 u = 56 ÷ 7 = 8
Number of brown balloons at first
= 10 u
= 10 x 8
= 80
Number of grey balloons at first
= 127 - 80
= 47
Answer(s): 47