amitgovin wrote:

If x is a positive number less than 10, is z greater than the average (arithmetic mean) of x and 10?

(1) On the number line, z is closer to 10 than it is to x

(2) z = 5x

(1) X................Average...........

Z.......10.......

Z, as one can see, z is always greater than the average of 10+x

(2) z=5x

x=1, Average=10+1/2=5,5, z=5 NO

x=2, Average=10+2/2=6, z=10 YES

Answer A

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