The school conference room is paved with square bricks. If you use square bricks with a side length of 2 decimeters, you need 350 pieces; if you use square bricks with a side length of 10 square decimeters, how many pieces are needed? (Answer with proportional knowledge)
学校会议室用方砖铺地．用边长2分米的方砖铺，需要350块；如果改用10平方分米的方砖铺，需要多少块？(用比例知识解答)
<gadget id="calculator">2 * 2 * 350</gadget>
<output>1_400</output>

<gadget id="calculator">1_400 / 10</gadget>
<output>140</output>

<result>140</result>