To pave the floor of a classroom with floor tiles, it takes 150 pieces to pave with floor tiles with a side length of 6 decimeters. If you use floor tiles with a side length of 5 decimeters instead, how many pieces are needed? (Solve with ratio)
用地砖铺一间教室的地面，用边长为6分米的地砖来铺需要150块．如果改用边长为5分米的地砖来铺，需要多少块？(用比例解)
<gadget id="calculator">6 * 6 * 150</gadget>
<output>5_400</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">5_400 / 25</gadget>
<output>216</output>

<result>216</result>