A bag of rice, eat 20% on the first day, eat 20 kilograms on the second day, eat 3/5 of this bag of rice in two days, how many kilograms of rice do you eat on the first day?
一袋大米，第一天吃去20%，第二天吃去20千克，两天共吃去这袋大米的(3/5)，第一天吃大米多少千克？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(3/5) - (1/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 / (2/5)</gadget>
<output>50</output>

<gadget id="calculator">50 * (1/5)</gadget>
<output>10</output>

<result>10</result>