Jen got 3 fish.  They each need $1 worth of food a day.  How much does she spend on food in the month of May?
He spends 3*1=$
<gadget id="calculator">3*1</gadget>
<output>3</output>
3 on food a day.
So he spends 3*31=$
<gadget id="calculator">3*31</gadget>
<output>93</output>
93 a month.

<result>93</result>