cylindrical glass jar container has a volume of 628 liters. If (1/4) of water is poured into the container, the water is still 30 cm away from the mouth of the jar. What is the bottom area of the container?
一个圆柱形玻璃缸容器，它的容积是628升，若向该容器注入(1/4)的水后，水离缸口还有30厘米，该容器底面积是多少？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">30 / 10</gadget>
<output>3</output>

<gadget id="calculator">(3/4) / 3</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">628 * (1/4)</gadget>
<output>157</output>

<result>157</result>