There is a cylindrical oil tank in Dongfeng Chemical Factory. The radius of its bottom surface measured from the inside is 4 meters, and its height is 20 meters. The oil tank has been injected with 3/4 of the oil volume. If each cubic meter of oil weighs 700 kilograms, how many kilograms does the oil weigh?
东风化工厂有一个圆柱形油罐，从里面量它的底面半径是4米，高是20米．油罐内已注入占容积(3/4)的石油．如果每立方米石油重700千克，这些石油重多少千克？
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3.14 * 16 * 20 * (3/4)</gadget>
<output>753.6</output>

<gadget id="calculator">753.6 * 700</gadget>
<output>527_520</output>

<result>527_520</result>