PSLEAt first, Leah had a total of 145 purple and red balloons. 12 red balloons burst. She then increased the number of purple balloons by 70%. After that, Leah had a total of 203 balloons. How many red balloons did she have at first?
|
Purple |
Red |
Total |
Before |
10 u |
|
145 |
Change |
+ 7 u |
- 12 |
+ 58 |
After |
17 u |
|
203 |
70100 =
710Increase in the number of balloons
= 203 - 145
= 58
7 u = 58 + 12
7 u = 70
1 u = 70 ÷ 7 = 10
Number of purple balloons at first
= 10 u
= 10 x 10
= 100
Number of red balloons at first
= 145 - 100
= 45
Answer(s): 45