A swimming pool is 25m long, 10m wide, and 2m deep. To lay tiles on the four walls and the bottom, the area of one tile is 2500cm**2, how many tiles are needed?
一个游泳池长25m，宽10m，深2m．要在四壁和底部铺瓷砖，一块瓷砖的面积为2500cm**2，需要瓷砖多少块？
<gadget id="calculator">25 * 10</gadget>
<output>250</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">2 * 25</gadget>
<output>50</output>

<gadget id="calculator">250 + 20 + 50</gadget>
<output>320</output>

<gadget id="calculator">320 * 2</gadget>
<output>640</output>

<gadget id="calculator">640 - 250</gadget>
<output>390</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">390 / (1/4)</gadget>
<output>1_560</output>

<result>1_560</result>