After adding M to the numerator and denominator of the fraction (8/23), it can be roughly divided into (5/8), M=how much.
分数(8/23)的分子、分母同时加上M后，约分为(5/8)，M=多少．
<gadget id="calculator">115 - 64</gadget>
<output>51</output>

<gadget id="calculator">51 / 3</gadget>
<output>17</output>

<result>17</result>