The blood of the human body accounts for (1/13) of the body weight, and about (2/3) of the blood is water. Dad's weight is 78 kilograms. How many kilograms of water does his blood contain?
人体的血液占体重的(1/13)，血液里约(2/3)是水，爸爸的体重是78千克，他的血液大约含水多少千克？
<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">78 * (1/13) * (2/3)</gadget>
<output>4</output>

<result>4</result>