The local firefighters are doing a “fill the boot” fundraiser. Their goal is to raise $6300. After the first 3 hours, they have raised $2100.  For how many hours do they have to fundraise in total to reach their goal, assuming an equal amount raised in every hour?
The fireman raise 2100 / 3 = $
<gadget id="calculator">2100/3</gadget>
<output>700</output>
700 per hour.
They have to fundraise for 6300 / 700 = 
<gadget id="calculator">6300/700</gadget>
<output>9</output>
9 hours.

<result>9</result>