Use the same square bricks to pave the floor, 30 bricks are used to pave 9 square meters, how many bricks are used to pave 12 square meters? (Solve with ratio)
用同样的方砖铺地，铺9平方米用砖30块，如果铺12平方米，要用多少块砖？(用比例解)
<gadget id="calculator">30 / 9</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">(10/3) * 12</gadget>
<output>40</output>

<result>40</result>