PSLEAt first, Leah had a total of 130 blue and red balloons. 14 red balloons burst. She then increased the number of blue balloons by 70%. After that, Leah had a total of 172 balloons. How many red balloons did she have at first?
|
Blue |
Red |
Total |
Before |
10 u |
|
130 |
Change |
+ 7 u |
- 14 |
+ 42 |
After |
17 u |
|
172 |
70100 =
710Increase in the number of balloons
= 172 - 130
= 42
7 u = 42 + 14
7 u = 56
1 u = 56 ÷ 7 = 8
Number of blue balloons at first
= 10 u
= 10 x 8
= 80
Number of red balloons at first
= 130 - 80
= 50
Answer(s): 50