The blood of the human body accounts for (1/13) of the body weight. Xiao Ming weighs 39 kg. How many grams of blood is there?
人体的血液占体重的(1/13)，小明体重39千克，血液有多少克？
<gadget id="calculator">1 / 13</gadget>
<output>1/13 = around 0.076923</output>

<gadget id="calculator">39 * (1/13) * 1_000</gadget>
<output>3_000</output>

<result>3_000</result>