A living room is 5.5 meters long and 4.2 meters wide. If you use floor tiles each with an area of 0.3 square meters, how many tiles are needed at least?
一间客厅长5.5米，宽4.2米．如果用每块面积为0.3平方米的地砖铺地，至少需要多少块？
<gadget id="calculator">4.2 / 0.3</gadget>
<output>14</output>

<gadget id="calculator">5.5 * 14</gadget>
<output>77</output>

<result>77</result>