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A group of y numbers has mean x. If the numbers 3 and 5 are removed from the group, the mean of remaining(y-2) numbers remains unchanged. Find x.

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xy-8 = x(y-2)
xy-8 = xy-2x
2x = 8
x = 4

This makes sense, since the two numbers removed must have the same mean as the whole bunch. Namely, (3+5)/2 = 4

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