PSLEAt first, Leah had a total of 74 pink and yellow balloons. 18 yellow balloons burst. She then increased the number of pink balloons by 70%. After that, Leah had a total of 84 balloons. How many yellow balloons did she have at first?
|
Pink |
Yellow |
Total |
Before |
10 u |
|
74 |
Change |
+ 7 u |
- 18 |
+ 10 |
After |
17 u |
|
84 |
70100 =
710Increase in the number of balloons
= 84 - 74
= 10
7 u = 10 + 18
7 u = 28
1 u = 28 ÷ 7 = 4
Number of pink balloons at first
= 10 u
= 10 x 4
= 40
Number of yellow balloons at first
= 74 - 40
= 34
Answer(s): 34