PSLEAt first, Leah had a total of 63 gold and grey balloons. 15 grey balloons burst. She then increased the number of gold balloons by 75%. After that, Leah had a total of 66 balloons. How many grey balloons did she have at first?
|
Gold |
Grey |
Total |
Before |
4 u |
|
63 |
Change |
+ 3 u |
- 15 |
+ 3 |
After |
7 u |
|
66 |
75100 =
34Increase in the number of balloons
= 66 - 63
= 3
3 u = 3 + 15
3 u = 18
1 u = 18 ÷ 3 = 6
Number of gold balloons at first
= 4 u
= 4 x 6
= 24
Number of grey balloons at first
= 63 - 24
= 39
Answer(s): 39