John wants to lose weight.  He eats 1800 calories a day and burns 2300 a day.  If he needs to burn 4000 calories to lose 1 pound how many days will it take to lose 10 pounds?
He burns 2300-1800=
<gadget id="calculator">2300-1800</gadget>
<output>500</output>
500 calories a day.
He needs to burn 4000*10=
<gadget id="calculator">4000*10</gadget>
<output>40_000</output>
40,000 calories to hit his goal.
That means it will take him 40,000/500=
<gadget id="calculator">40000/500</gadget>
<output>80</output>
80 days.

<result>80</result>