Three numbers □, □5, □49, the second number is the average of the other two numbers, what is the sum of the three numbers? (Only one number can be filled in each box).
三个数□、□5、□49，其中第二个数是另两个数的平均数，则三个数的和是多少．(每个方框里只能填一个数字)．
<gadget id="calculator">1 + 75 + 149</gadget>
<output>225</output>

<result>225</result>