Human blood accounts for about (1/13) of body weight, and about (2/3) of blood is water. Wang Zhuang's weight is 39 kilograms, how many kilograms of water is in his blood?
人的血液大约占体重的(1/13)，血液里大约有(2/3)是水．王壮的体重是39千克，他的血液里大约含水多少千克？
<gadget id="calculator">1 / 13</gadget>
<output>1/13 = around 0.076923</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">39 * (1/13) * (2/3)</gadget>
<output>2</output>

<result>2</result>