Judy uses 10 pencils during her 5 day school week. A 30 pack of pencils costs $4. How much will she spend on pencils over 45 days?
She uses 2 pencils a day because 10 / 5 = 
<gadget id="calculator">10/5</gadget>
<output>2</output>
2.
She will use 90 pencils in 45 days because 2 x 45 = 
<gadget id="calculator">2*45</gadget>
<output>90</output>
90.
She will need 3 packs of pencils because 90 / 30 = 
<gadget id="calculator">90/30</gadget>
<output>3</output>
3.
She will spend $12 because 3 x 4 = 
<gadget id="calculator">3*4</gadget>
<output>12</output>
12.

<result>12</result>