Use wooden boards to pave the floor, and use 294 wooden boards to pave 14 square meters. If you lay an additional 7 square meters, how many wooden boards are needed in total? (Proportion)
用木板铺地，铺14平方米用木板条294条，如再多铺7平方米，共需木条多少条？(比例)
<gadget id="calculator">14 + 7</gadget>
<output>21</output>

<gadget id="calculator">14 / 294</gadget>
<output>1/21 = around 0.047619</output>

<gadget id="calculator">21 / (1/21)</gadget>
<output>441</output>

<result>441</result>