If the numerator is enlarged by 2 times and the denominator is reduced by 7 times, it can be reduced to (1/15). What is the simplest fraction?
一个最简分数如分子扩大2倍，分母缩小7倍后化简成(1/15)，这个最简分数是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">15 * 7</gadget>
<output>105</output>

<gadget id="calculator">(1/2) / 105</gadget>
<output>1/210 = around 0.004762</output>

<result>1/210 = around 0.004762</result>