It takes Alisa ten minutes to fill a dozen water balloons. She wants to calculate how long it will take her to fill all the water balloons if each friend at her party gets a dozen balloons. What variable is needed to calculate the time it will take to fill all the balloons?
A.
d, the amount of time it takes Alisa to fill a dozen balloons
B.
b, the number of bags of water balloons Alisa bought
C.
f, the number of friends attending Alisa's party
D.
s, the number of students in Alisa's math class
C. f, the number of friends attending Alisa's party. This is needed to know how many dozen water balloons Alisa will need to fill, which will then be used to calculate the total time it will take her.
can you double check?
Yes, I can double-check my answer.
To calculate the time it will take Alisa to fill all the water balloons, we need to first find out how many dozens of water balloons she needs to fill. Since each friend at her party gets a dozen balloons and we know the number of friends attending (variable f), we can use multiplication to find the total number of balloons needed:
Total number of balloons = 12 x f
Once we have this number, we can use Alisa's rate (variable d) of filling a dozen balloons in 10 minutes to find out how long it will take her to fill all the balloons. To do this, we can use the formula:
Time = (Number of balloons) x (Time per dozen balloons) / 12d
Substituting the values we have:
Time = (12 x f) x 10 / 12d
Therefore, the variable that we need to calculate the time it will take Alisa to fill all the water balloons is the number of friends attending Alisa's party, which corresponds to option C.