A bag of flour, 20% is used for the first time, (3/10) is used for the second time, and 5 kg more is used for the second time than the first time. How many kilograms is this bag of flour in total?
一袋面粉，第一次用去20%，第二次用去(3/10)，第二次比第一次多用去5千克．这袋面粉共多少千克？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

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

<gadget id="calculator">(3/10) - (1/5)</gadget>
<output>1/10 = around 0.1</output>

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

<result>50</result>