The product of two factors is (8/15), one of which is (2/3), and what is the other factor.
两个因数的积是(8/15)，其中一个因数是(2/3)，另一个因数是多少．
<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

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

<gadget id="calculator">(8/15) / (2/3)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>