PSLEAt first, Leah had a total of 104 pink and grey balloons. 11 grey balloons burst. She then increased the number of pink balloons by 70%. After that, Leah had a total of 135 balloons. How many grey balloons did she have at first?
|
Pink |
Grey |
Total |
Before |
10 u |
|
104 |
Change |
+ 7 u |
- 11 |
+ 31 |
After |
17 u |
|
135 |
70100 =
710Increase in the number of balloons
= 135 - 104
= 31
7 u = 31 + 11
7 u = 42
1 u = 42 ÷ 7 = 6
Number of pink balloons at first
= 10 u
= 10 x 6
= 60
Number of grey balloons at first
= 104 - 60
= 44
Answer(s): 44