PSLEAt first, Leah had a total of 49 grey and yellow balloons. 13 yellow balloons burst. She then increased the number of grey balloons by 75%. After that, Leah had a total of 48 balloons. How many yellow balloons did she have at first?
|
Grey |
Yellow |
Total |
Before |
4 u |
|
49 |
Change |
+ 3 u |
- 13 |
- 1 |
After |
7 u |
|
48 |
75100 =
34Decrease in the number of balloons
= 49 - 48
= 1
3 u = 13 - 1
3 u = 12
1 u = 12 ÷ 3 = 4
Number of grey balloons at first
= 4 u
= 4 x 4
= 16
Number of yellow balloons at first
= 49 - 16
= 33
Answer(s): 33