A fraction whose numerator is reduced by 2 times is (2/5), if the denominator of this fraction is enlarged by 3 times, what is the result?
一个分数，把它的分子缩小2倍后是(2/5)，如果把这个分数的分母扩大3倍，那么结果是多少．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>