For a bag of flour, 30% of the total amount is used for the first time, and 23% of the total amount is used for the second time, and the second time is 0.7 kg less than the first time. How many kg does this bag of flour originally have?
一袋面粉，第一次用去总数的30%，第二次用去总数的23%，第二次比第一次少用0.7千克，这袋面粉原来有多少千克？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">23 / 100</gadget>
<output>23/100 = around 0.23</output>

<gadget id="calculator">(3/10) - (23/100)</gadget>
<output>7/100 = around 0.07</output>

<gadget id="calculator">0.7 / (7/100)</gadget>
<output>10</output>

<result>10</result>