m and n are natural numbers, if (3/4)<((n)/(m))<(4/5), then what is the minimum value of m+n.
m、n为自然数，若(3/4)＜((n)/(m))＜(4/5)，则m+n的最小值是多少．
<gadget id="calculator">7 + 9</gadget>
<output>16</output>

<result>16</result>