If a fraction is multiplied by (2/3) and (5/6), the sum of the products is (9/10). What is the fraction?
一个分数分别与(2/3)，(5/6)相乘，其积的和是(9/10)，这个分数是多少．
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

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

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(2/3) + (5/6)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(9/10) / (3/2)</gadget>
<output>3/5 = around 0.6</output>

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