Cole had a total of 133 black and white balloons. After giving away
411 of the black balloons and 61 white balloons, there was an equal number of black and white balloons left. How many black balloons did he have at first?
|
Black balloons |
White balloons |
Total |
Before |
11 u |
7 u + 61 |
133 |
Change |
- 4 u |
- 61 |
|
After |
7 u |
7 u |
|
Total number of balloons at first
= 11 u + 7 u + 61
= 18 u + 61
18 u + 61 = 133
18 u = 133 - 61
18 u = 72
1 u = 72 ÷ 18 = 4
Number of black balloons that Cole had at first
= 11 u
= 11 x 4
= 44
Answer(s): 44