The blood in the human body accounts for about (1/13) of the body weight, and the blood contains about (2/3) water. Lele's weight is 39kg. Please calculate how many kilograms of water is contained in Lele's blood.
人体内的血液约占体重的(1/13)，血液中约含有(2/3)的水．乐乐的体重为39kg．请你算一算乐乐的血液中含有多少千克水．
<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>