You need to pay 28 yuan to buy 10 kilograms of rice, and how much you need to pay to buy 5.4 kilograms of the same rice.
买10千克大米需付28元，买5.4千克同样的大米需付多少元．
<gadget id="calculator">28 / 10</gadget>
<output>14/5 = around 2.8</output>

<gadget id="calculator">(14/5) * 5.4</gadget>
<output>15.12</output>

<result>15.12</result>