PSLEAt first, Leah had a total of 110 blue and grey balloons. 12 grey balloons burst. She then increased the number of blue balloons by 70%. After that, Leah had a total of 154 balloons. How many grey balloons did she have at first?
|
Blue |
Grey |
Total |
Before |
10 u |
|
110 |
Change |
+ 7 u |
- 12 |
+ 44 |
After |
17 u |
|
154 |
70100 =
710Increase in the number of balloons
= 154 - 110
= 44
7 u = 44 + 12
7 u = 56
1 u = 56 ÷ 7 = 8
Number of blue balloons at first
= 10 u
= 10 x 8
= 80
Number of grey balloons at first
= 110 - 80
= 30
Answer(s): 30