In a rectangular container with a bottom of 20 square centimeters, kerosene is installed. Several steel balls weighing 7.8 grams per cubic centimeter are immersed in the oil. The steel balls weigh 702 grams in total. If these small balls are taken out of the water, the liquid level How many centimeters will it drop?
在一个底面是20平方厘米的长方形容器中，装有煤油，油中浸有几个每立方厘米重7.8克的钢球，钢球共重702克，若从水中捞出这些小球，液面将下降多少厘米？
<gadget id="calculator">702 / 7.8</gadget>
<output>90</output>

<gadget id="calculator">90 / 20</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>