It is known that the product of two factors is (4/15), one of which is (2/3), and what is the other factor.
已知两个因数的积是(4/15)，其中一个因数是(2/3)，另一个因数是多少．
<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

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

<gadget id="calculator">(4/15) / (2/3)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>