A set of books costs 120 yuan, and Wang Weiye saves 8 yuan every week. How many weeks does it take to buy this set of books?
一套书120元，王伟业每周存8元，存几周的钱才够买这套书？
<gadget id="calculator">120 / 8</gadget>
<output>15</output>

<result>15</result>