Let us assume the least number of weeks Hank needs to save = x The amount of money Hank needs to save = $150 Number of weeks in which Hank saves 12 dollars = 1 hen The number of weeks in which Hank saves 150 dollars = (1/12) * 150 = 12.5 weeks So the number of weeks required by Hank to save $150 is 12.5 weeks. I hope the procedure is simple enough for you to understand. You can always use this method for solving similar problems without requiring any help from outside.