PSLEAt first, Leah had a total of 124 white and grey balloons. 20 grey balloons burst. She then increased the number of white balloons by 70%. After that, Leah had a total of 167 balloons. How many grey balloons did she have at first?
|
White |
Grey |
Total |
Before |
10 u |
|
124 |
Change |
+ 7 u |
- 20 |
+ 43 |
After |
17 u |
|
167 |
70100 =
710Increase in the number of balloons
= 167 - 124
= 43
7 u = 43 + 20
7 u = 63
1 u = 63 ÷ 7 = 9
Number of white balloons at first
= 10 u
= 10 x 9
= 90
Number of grey balloons at first
= 124 - 90
= 34
Answer(s): 34