4/(2/3)X=(2/5).
4/(2/3)X=(2/5)．
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">20 * (3/4)</gadget>
<output>15</output>

<result>15</result>