The ratio of blood mass to body weight in an adult is about 1:13. Tan Liang's weight is 52 kilograms, so how many grams of blood is in his body?
成年人体内血液的质量与体重的比大约是1：13．谭亮的体重是52千克，那么他体内的血液大约有多少克．
<gadget id="calculator">1 / 13</gadget>
<output>1/13 = around 0.076923</output>

<gadget id="calculator">52 * (1/13) * 1_000</gadget>
<output>4_000</output>

<result>4_000</result>