Liangliang and Meimei each have some candy. Liangliang: I am (9/10) kilograms more than you; Meimei: If you give me (1/5) kilograms, how many kilograms are you more than me?
亮亮和美美各有一些糖果．亮亮：我比你多(9/10)千克；美美：你给我(1/5)千克，你还比我多多少千克？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * 2</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(9/10) - (2/5)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>