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Bunuel
Is 20 the average (arithmetic mean) of a, b, and 20 ?

(1) a + b = 40
(2) a – b = 2


PS21266


Statement 1: a + b = 40

a+ b+ 20 = 40+20 = 60, thus average = 60/3 = 20.

Thus Sufficient


Statement 2: a – b = 2

We cannot calculate the values of a, b or the sum of a & b, so this statement is clearly insufficient.
We can only assume the values : a =21, b =19, which would make the statement true, but a & b could be anything, so an incomplete statement.

Thus Insufficient.



Answer A.
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Hello from the GMAT Club BumpBot!

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