The area to be painted in a room is about 65 square meters, and generally 0.4 kg is needed per square meter. But it will be lost in actual use, so it is necessary to prepare more (1/10), how many kilograms are actually prepared?
某房间需粉刷的面积约为65平方米，一般每平方米需要用0.4千克．但在实际运用中会有所损耗，因此要多准备(1/10)，实际准备多少千克？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">0.4 * (11/10) * 65</gadget>
<output>28.6</output>

<result>28.6</result>