Patricia has 4 barrels of 7 gallons each. All of them are empty, and there's only one faucet with a flow rate of 3.5 gallons per minute. How many minutes will it take to fill all 4 barrels?
If Patricia has 4 barrels and each barrel has 7 gallons, then in total she needs 4*7=
<gadget id="calculator">4*7</gadget>
<output>28</output>
28 gallons.
If the faucet can provide 3.5 gallons every minute, then she will need 28/3.5=
<gadget id="calculator">28/3.5</gadget>
<output>8</output>
8 minutes to fill all 4 barrels.

<result>8</result>