If a fraction ((A)/(B)) is reduced to the simplest fraction (5/6), if the numerator and denominator are increased by 4 at the same time, then the fraction is (21/25). Find the value of A+B.
一个分数((A)/(B))若化为最简分数为(5/6)，若分子分母同时增加4，则化成分数为(21/25)，求：A+B的值．
<gadget id="calculator">80 + 96</gadget>
<output>176</output>

<result>176</result>