The cafeteria bought a batch of flour. If you eat 50 kilograms a day, you can finish it in 30 days. If you eat 10 kg more per day. How many days less flour is this batch than the original?
食堂买来一批面粉，如果每天吃50千克，30天可以吃完．如果每天多吃10千克．这批面粉比原来少吃几天？
<gadget id="calculator">50 + 10</gadget>
<output>60</output>

<gadget id="calculator">30 / 60</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">50 * (1/2)</gadget>
<output>25</output>

<gadget id="calculator">30 - 25</gadget>
<output>5</output>

<result>5</result>