xy/-3
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3 A dozen is equal to twelve and twelve divided by four, to make one fourth, is three
xy + xy = 2xy
Suppose the numbers are x and y. The sum of their reciprocals = 1/x + 1/y = y/xy + x/xy = (y+x)/xy = (x+y)/xy = 10/30 = 1/3
((72 divided by 8) divided by 3) divided by 3 = 1