The length of a rectangular kitchen is 30 decimeters and the width is 24 decimeters. Now the floor is paved with square bricks, which cannot be cut. What is the minimum number of square bricks needed.
一个长方形厨房的长是30分米，宽24分米，现在选用方砖铺地，方砖不能被切割．最少需要多少块方砖．
<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<gadget id="calculator">24 / 6</gadget>
<output>4</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>