The blood in an adult's body accounts for about 1/4 of the body weight. For a person weighing 65 kg, how much does the blood weigh?
一名成年人身上的血液约占体重的(1/4)，体重65千克的人，血液重多少千克？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">65 * (1/4)</gadget>
<output>65/4 = around 16.25</output>

<result>65/4 = around 16.25</result>