One liter of kerosene weighs (4/5) kilograms, and one liter of gasoline weighs (7/10) kilograms. How many kilograms is one liter of gasoline lighter than one liter of kerosene?
1升煤油重(4/5)千克，一升汽油重(7/10)千克，一升汽油比一升煤油轻多少千克？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(4/5) - (7/10)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>