Xiao Ming's family bought a bag of rice, ate 9 kilograms in the first week, ate 40% in the second week, and left 6 kilograms. How many kilograms is this bag of rice in total?
小明家买了一袋大米，第一周吃去9千克，第二周吃去了40%，还剩下6千克．这袋大米共多少千克？
<gadget id="calculator">9 + 6</gadget>
<output>15</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">15 / (3/5)</gadget>
<output>25</output>

<result>25</result>