For the floor of a room to stick to the ground, if you use floor tiles with an area of 6 square decimeters, it is just right to use 160. If you use square floor tiles with a side length of 8 decimeters, how many pieces are needed at least?
给一个房间的地面贴地转，如果用面积为6平方分米的地砖，用160块正好．如果改用边长8分米的正方形地砖，至少需要多少块？
<gadget id="calculator">8 * 8</gadget>
<output>64</output>

<gadget id="calculator">160 / 64</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">6 * (5/2)</gadget>
<output>15</output>

<result>15</result>