PSLEAt first, Leah had a total of 74 gold and black balloons. 20 black balloons burst. She then increased the number of gold balloons by 75%. After that, Leah had a total of 72 balloons. How many black balloons did she have at first?
|
Gold |
Black |
Total |
Before |
4 u |
|
74 |
Change |
+ 3 u |
- 20 |
- 2 |
After |
7 u |
|
72 |
75100 =
34Decrease in the number of balloons
= 74 - 72
= 2
3 u = 20 - 2
3 u = 18
1 u = 18 ÷ 3 = 6
Number of gold balloons at first
= 4 u
= 4 x 6
= 24
Number of black balloons at first
= 74 - 24
= 50
Answer(s): 50