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
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.
$150* (1 week/ $12)= 12 1/2 weeks.
Hank needs to save money in 12 1/2 weeks in order to save $150