solving a decimal word problem using a two-step linear

Question

Reuben pays A monthly fee of $12 and he paid an additional 0.05 per minute of use. The least he can be charged in a month is $82.40 what are the possible numbers of minutes he has used his phone in a month

Answer 1

Cost = 12 +.05M > 82.4

M > (82.4 -12)/.05 = (70.4)/.05 = 1408 minutes minimum

1408/60 = slightly less than 23 1/2 hours minimum. .