Jame is trying to learn to tear playing cards.  He can tear 30 cards at a time.  A new deck of cards has 55 cards if you include the jokers and blank cards.  He tears cards 3 times a week.  If he buys 18 decks how many weeks can he go?
He tears 30*3=
<gadget id="calculator">30*3</gadget>
<output>90</output>
90 cards a week.
He bought 55*18=
<gadget id="calculator">55*18</gadget>
<output>990</output>
990 cards.
So he can tear for 990/90=
<gadget id="calculator">990/90</gadget>
<output>11</output>
11 weeks.

<result>11</result>