An apple weighs (3/7) kilograms, then how many kilograms does (2/3) apples weigh?
一个苹果重(3/7)千克，那么(2/3)个苹果重多少千克．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/7) * (2/3)</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>