PSLEAt first, Leah had a total of 69 black and silver balloons. 17 silver balloons burst. She then increased the number of black balloons by 80%. After that, Leah had a total of 76 balloons. How many silver balloons did she have at first?
|
Black |
Silver |
Total |
Before |
5 u |
|
69 |
Change |
+ 4 u |
- 17 |
+ 7 |
After |
9 u |
|
76 |
80100 =
45Increase in the number of balloons
= 76 - 69
= 7
4 u = 7 + 17
4 u = 24
1 u = 24 ÷ 4 = 6
Number of black balloons at first
= 5 u
= 5 x 6
= 30
Number of silver balloons at first
= 69 - 30
= 39
Answer(s): 39