Gina's snake eats one mouse every 4 weeks. How many mice will it eat in a decade?
First find the number of mice the snake eats each year: 52 weeks/year / 4 weeks/mouse = 
<gadget id="calculator">52/4</gadget>
<output>13</output>
13 mice/year.
Then multiply the number of mice the snake eats per year by the number of years per decade to find the number of mice it eats per decade: 13 mice/year * 10 years/decade = 
<gadget id="calculator">13*10</gadget>
<output>130</output>
130 mice/decade.

<result>130</result>