A fraction converted into the simplest fraction is (5/18), and the numerator of the original fraction is enlarged to 3 times to be 75, so what is the denominator of the original fraction.
一个分数化成最简分数是(5/18)，原分数的分子扩大到原来的3倍后是75，那么原分数的分母是多少．
<gadget id="calculator">18 * 5</gadget>
<output>90</output>

<result>90</result>