It is known that the product of two factors is (7/15), one of which is (7/9), and what is the other factor.
已知两个因数的积是(7/15)，其中一个因数是(7/9)，另一个因数是多少．
<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">(7/15) / (7/9)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>