Answer: 420 minutes.
Step-by-step explanation:
The first method could be to do 180 / 3 then multiply that by seven:
180 / 3 = 60
60 * 7 = 420.
That solution would be to find out what 1/7 of her total monthly minutes is, and then multiplying it in order to get the total monthly minutes.
Another solution could be to divide 180 by 3/7:
180 / (3/7) = 420
