An alcohol bottle with a cylindrical body (not including the neck), as shown in the figure, has a volume of 101 cubic centimeters. When the bottle is placed upright, the height of the alcohol in the bottle is 6 cm. When the bottle is placed upside down, the height of the empty part is 2 cm. What is the volume of alcohol in the bottle?
一个酒精瓶，它的瓶身呈圆柱形(不包括瓶颈)，如图所示，它的容积为101立方厘米．当瓶子正放时，瓶内的酒精的液面高为6厘米，瓶子倒放时，空余部分的高为2厘米，则瓶内酒精体积是多少立方厘米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">101 * (3/4)</gadget>
<output>303/4 = around 75.75</output>

<result>303/4 = around 75.75</result>