A classroom should be paved with square bricks. If the square bricks with a side length of 6 decimeters are used, 960 pieces are needed. If the square bricks with a side length of 4 decimeters are used instead, how many pieces are needed? (Solve with ratio)
一间教室要用方砖铺地．用边长是6分米的正方形方砖，需要960块，如果改用边长为4分米的正方形方砖，需要多少块？(用比例解)
<gadget id="calculator">6 * 6 * 960</gadget>
<output>34_560</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">34_560 / 16</gadget>
<output>2_160</output>

<result>2_160</result>