Archie received his medical receipt from his doctor, and he needs to take antibiotics three times a day. If antibiotic costs $3 each and he needs to take it for a week, how much money does he need to buy the antibiotics?
Archie needs $3 x 3 = $
<gadget id="calculator">3*3</gadget>
<output>9</output>
9 per day to buy 3 antibiotics.
Therefore Archie needs $9 x 7 = $
<gadget id="calculator">9*7</gadget>
<output>63</output>
63 to buy antibiotics that will last for a week.

<result>63</result>