A
Formula
Total time = Time for 1 commercial * Number of commercials.
Givens
Total Time = 3.6 minutes
Time for 1 commercial = 0.6 minutes
# commercials = x
Solve
3.6 = 0.6 * x Divide both sides by 0.6
3.6 / 0.6 = x
x = 6 commercials.
B
Just use the formula again, only this time, use 0.3 for the amount of time needed for 1 commercial.
3.6 minutes = 0.3 * number of commercials
3.6/0.3 = number of commercials.
12 = number of commercials.