A bag of flour weighs 3kg, and (3/10) of it has been eaten, how many kilograms have been eaten?
一袋面粉重3kg，已经吃了它的(3/10)，吃了多少千克？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">3 * (3/10)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>