In an acute triangle, the measures of the three interior angles are all integers and unequal. It is known that the degree of the largest angle is 4 times the number of the smallest angle, so what is the maximum degree that the third angle can be.
在一个锐角三角形中，三个内角的度数均为整数且互不相等．已知最大角的度数是最小角度数的4倍，那么第三个角最大可以是多少度．
<gadget id="calculator">180 - 21 - 84</gadget>
<output>75</output>

<result>75</result>