PSLEAt first, Leah had a total of 55 red and grey balloons. 16 grey balloons burst. She then increased the number of red balloons by 80%. After that, Leah had a total of 51 balloons. How many grey balloons did she have at first?
|
Red |
Grey |
Total |
Before |
5 u |
|
55 |
Change |
+ 4 u |
- 16 |
- 4 |
After |
9 u |
|
51 |
80100 =
45Decrease in the number of balloons
= 55 - 51
= 4
4 u = 16 - 4
4 u = 12
1 u = 12 ÷ 4 = 3
Number of red balloons at first
= 5 u
= 5 x 3
= 15
Number of grey balloons at first
= 55 - 15
= 40
Answer(s): 40