A barrel of oil weighs 5 kilograms, first use all (1/2), and then use (1/2) kilograms, how many kilograms are used in total
一桶油重5千克，先用去全部的(1/2)，再用去(1/2)千克，一共用去多少千克
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">5 * (1/2)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) + (1/2)</gadget>
<output>3</output>

<result>3</result>