Question

For her phone service Heather pays a monthly fee of $27 and she pays an additional $0.06 per minute of use. The least she has been charged in a month is $87.90. What are the possible numbers of minutes she has used her phone in a month?

Answer 1

The answer is any number from 1015 to 44,640 minutes.

Explanation:

$87.90-$27=$60.9

$60.9/$0.06=1015

So possible numbers of minutes she has used her phone in a month are 1015 and any number above that up to 44,640 minutes. (If we suppose that it is for instance July - month with 31 days, she could call maximally 44,640 minutes, because she could not use her mobile more minutes than there are in the month.