The blood in the human body accounts for about (1/13) of the body weight, and (2/3) in the blood is water. Xiao Hua's weight is 39 kg. How many kilograms of water does his blood contain?
人体中的血液约占体重的(1/13)，血液里的(2/3)是水．小华的体重是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>