There is a bag of rice, 40% of the total amount was eaten in the first week, and 30% of the total amount was eaten in the second week, and 6 kg more was eaten in the first week than in the second week, what is the original kilogram of this bag of rice?
有一袋大米，第一周吃了总数的40%，第二周吃了总数的30%，第一周比第二周多吃了6千克，这袋大米原有多少千克．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(2/5) - (3/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">6 / (1/10)</gadget>
<output>60</output>

<result>60</result>