PSLEAt first, Leah had a total of 127 brown and grey balloons. 19 grey balloons burst. She then increased the number of brown balloons by 70%. After that, Leah had a total of 171 balloons. How many grey balloons did she have at first?
|
Brown |
Grey |
Total |
Before |
10 u |
|
127 |
Change |
+ 7 u |
- 19 |
+ 44 |
After |
17 u |
|
171 |
70100 =
710Increase in the number of balloons
= 171 - 127
= 44
7 u = 44 + 19
7 u = 63
1 u = 63 ÷ 7 = 9
Number of brown balloons at first
= 10 u
= 10 x 9
= 90
Number of grey balloons at first
= 127 - 90
= 37
Answer(s): 37