A classroom needs 280 square bricks with an area of 0.25 square meters to pave the floor. If the floor is paved with square bricks with an area of 0.4 square meters, how many square bricks are needed? (Solve with ratio)
一间教室，用面积是0.25平方米的方砖铺地，需要280块，如果用面积是0.4平方米的方砖铺地，需要方砖多少块？(用比例解)
<gadget id="calculator">0.25 * 280</gadget>
<output>70</output>

<gadget id="calculator">70 / 0.4</gadget>
<output>175</output>

<result>175</result>