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the answer is y minus 10 divided by 2.
Suppose the numbers are x and y Then the sum of their reciprocals is 1/x + 1/y = y/xy + x/xy = (y+x)/xy = 10/20 = 1/2
2(2+Y)
2(x+y) is twice the sum of x and y, and 2x+y is the sum of twice x and y
x = 10, y = 25