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GMAT Math Practice Test #1

Category - Math

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If x+y=6, y+z=7 and z+x=9, what is the average(arithmetic mean) of x, y and z?

11/3
22/3
11
22

Explanation

Answer A

Add the three equations

x+y=6
y+z=7
z+x=9

2x +2y +2z =22
x+y+z = 11
or (x=y+z)/3 = 11/3

Key takeaway: First have a close look at the pattern of the give equations for any simpleway to attack such problems. Sometimes simply adding or subtracting the equations may yield the desired result.

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GMAT Math Practice Test #1

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