In the human body, blood accounts for about (1/13) of body weight, and blood contains about (2/3) of water. Dad's weight is 69 kg. How many kg of water is in dad's blood?
在人体中，血液约占体重的(1/13)，血液里约含(2/3)的水，爸爸的体重是69千克，爸爸的血液里约含水多少千克？
<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">69 * (1/13) * (2/3)</gadget>
<output>46/13 = around 3.538462</output>

<result>46/13 = around 3.538462</result>