Bananas cost m yuan per kilogram. My mother bought 6 kilograms and paid 50 yuan. How much should I get back?
香蕉每千克m元，妈妈买了6千克，付出50元，应找回多少元．
<gadget id="calculator">50 - 6</gadget>
<output>44</output>

<result>44</result>