A cylindrical oil barrel has a radius of 5 decimeters measured from the inside and a depth of 12 decimeters. If the weight of oil per liter is 0.85 kg, how much oil can this barrel hold?
一个圆柱形油桶，从里面量半径是5分米，深12分米．如果每升油重0.85千克，这个油桶可装油多少千克？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 12</gadget>
<output>942</output>

<gadget id="calculator">0.85 * 942</gadget>
<output>800.7</output>

<result>800.7</result>