Fanny had 90 balloons.
15 of the balloons burst and she gave away
78 of the good balloons. How many balloons did she have left?
| |
Good balloons |
Burst balloons |
Total balloons |
Comparing good and
burst balloons at first |
4x2 =
8 u
|
1x2 =
2 u
|
5x2 =
10 u
|
| Before |
8 u |
2 u |
|
| Change |
- 7 u |
|
|
| After |
1 u |
2 u |
|
The number of good balloons is repeated. Make the number of good balloons the same. LCM of 4 and 8 is 8.
Total number of balloons at first = 10 u
1 u = 90 ÷ 10 = 9
Number of balloons that Fanny had left
= 1 u
= 9
Answer(s): 9
