Use the same bricks to pave the floor, 309 bricks are used to pave 9 square meters, how many bricks are used to pave 12 square meters?
用同样的砖铺地，铺9平方米用砖309块，如果铺12平方米要用多少块砖？
<gadget id="calculator">12 / 9</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">309 * (4/3)</gadget>
<output>412</output>

<result>412</result>