Usually, the ratio of blood mass to body weight is 1:13, and Xiao Liu weighs 35 kilograms. How many kilograms does the blood in his body weigh?
通常人的血液质量与体重比是1：13，小刘的体重35千克，他身上的血液重几千克？
<gadget id="calculator">1 + 13</gadget>
<output>14</output>

<gadget id="calculator">1 / 14</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">35 * (1/14)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>