PSLEAt first, Leah had a total of 116 green and grey balloons. 15 grey balloons burst. She then increased the number of green balloons by 70%. After that, Leah had a total of 150 balloons. How many grey balloons did she have at first?
|
Green |
Grey |
Total |
Before |
10 u |
|
116 |
Change |
+ 7 u |
- 15 |
+ 34 |
After |
17 u |
|
150 |
70100 =
710Increase in the number of balloons
= 150 - 116
= 34
7 u = 34 + 15
7 u = 49
1 u = 49 ÷ 7 = 7
Number of green balloons at first
= 10 u
= 10 x 7
= 70
Number of grey balloons at first
= 116 - 70
= 46
Answer(s): 46