PSLEAt first, Leah had a total of 109 purple and gold balloons. 20 gold balloons burst. She then increased the number of purple balloons by 70%. After that, Leah had a total of 138 balloons. How many gold balloons did she have at first?
|
Purple |
Gold |
Total |
Before |
10 u |
|
109 |
Change |
+ 7 u |
- 20 |
+ 29 |
After |
17 u |
|
138 |
70100 =
710Increase in the number of balloons
= 138 - 109
= 29
7 u = 29 + 20
7 u = 49
1 u = 49 ÷ 7 = 7
Number of purple balloons at first
= 10 u
= 10 x 7
= 70
Number of gold balloons at first
= 109 - 70
= 39
Answer(s): 39