An adult's blood accounts for about 2/5 of his body weight. How many kilograms of blood does a person weighing 65 kilograms weigh?
一名成年人身上的血液约占体重的(2/5)．体重65千克的人，血液约重多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>