PSLEAt first, Leah had a total of 53 white and grey balloons. 20 grey balloons burst. She then increased the number of white balloons by 75%. After that, Leah had a total of 45 balloons. How many grey balloons did she have at first?
|
White |
Grey |
Total |
Before |
4 u |
|
53 |
Change |
+ 3 u |
- 20 |
- 8 |
After |
7 u |
|
45 |
75100 =
34Decrease in the number of balloons
= 53 - 45
= 8
3 u = 20 - 8
3 u = 12
1 u = 12 ÷ 3 = 4
Number of white balloons at first
= 4 u
= 4 x 4
= 16
Number of grey balloons at first
= 53 - 16
= 37
Answer(s): 37