The human heart can expel about (7/100) liters of blood every time it beats. Xiaowen's heart beats 70 times per minute on average, how many liters of blood can it discharge?
人的心脏每跳动一次能排出约(7/100)升血液．小文的心脏平均每分钟跳70次，大约能排出多少升血液？
<gadget id="calculator">7 / 100</gadget>
<output>7/100 = around 0.07</output>

<gadget id="calculator">(7/100) * 70</gadget>
<output>49/10 = around 4.9</output>

<result>49/10 = around 4.9</result>