If a classroom is paved with square bricks with a side length of 4 decimeters, 200 pieces will be used. How many bricks will be used if square bricks with a side length of 2 decimeters are used instead? (Solve with ratio)
一间教室，如果用边长4分米的方砖铺地要用200块，若改用边长2分米的方砖要用多少块砖？(用比例解)
<gadget id="calculator">4 * 4 * 200</gadget>
<output>3_200</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">3_200 / 4</gadget>
<output>800</output>

<result>800</result>