Charmaine purchased a prepaid phone card for $25. Long distance phone calls cost 6 cents a minute using this card. Charmaine used her card only once to make a long distance call. If the remaining balance is $22.24, how many minutes did her call last

answer

46 minutes

set up equation

total = money spent + money left

total = 25 since she started with 25 dollars

money left = 22.24 since this is how much is remaining

money spent = 0.06x where x is the number of minutes, since it cost 6 cents or 0.06 dollars each minute

plug in values and solve

total = money spent + money left

25 = 0.06x + 22.24 subtract 22.24 from both sides

2.76 = 0.06x divide x from both sides

46 = x