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# In 2010, there were four used-car dealers in City Z. The graphic shows

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Re: In 2010, there were four used-car dealers in City Z. The graphic shows [#permalink]
LalaB
VeritasPrepKarishma

Actually, the OE is fine.

Take a simpler view:

Average of 4 numbers is 15. (Total sum of all four numbers will be 60.)
Two of the numbers are 20 and 22. Both the numbers are more than the average.
Sorry, but I didnt get where from u got numbers 15 ,20 and 22
could u please elaborate a bit more?

The numbers are just an example.
If average of 4 numbers is 15, the total sum of the numbers will be 15*4 = 60
If two of the numbers are 20 and 22 (both more than the average), then their sum is more than half the total sum (because half of the numbers are more than the average) i.e. the sum of these two numbers will be more than 30.
The other two numbers will add up to be less than half the total sum i.e. the other two numbers will add up to be less than 30.

This question tests the same concept.
The white squares are the average. In almost all months, the black squares and the white circles are above the average i.e. sales of ABC and XYZ are above the average. So they will sum up to be more than half the total sum.
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Re: In 2010, there were four used-car dealers in City Z. The graphic shows [#permalink]
Official Explanation

1. ABC Cars and XYZ Automotive accounted for_______half of all used-car sales in City Z for 2010.

Since the white circles (connected by blue lines) and the filled squares (connected by black lines) in the graph are consistently at or above the empty squares (connected by dotted lines), it follows that both ABC Cars and XYZ Automotive were at or above the citywide average for every single month in 2010. Thus their combined sales must have been greater than the combined sales of the two dealers not included in the graph. Therefore ABC Cars and XYZ Automotive must have accounted for more than half of all used-car sales in City Z in 2010.

The correct answer is more than.

2. In June 2010, the two used-car dealers that are not specified by the graphic sold a total of exactly______________cars.

In June 2010, the citywide average was 26 cars. This means that the four dealers sold a combined 4(26) = 104 cars. Of those 104 cars, ABC Cars sold 30 and XYZ Automotive sold 28. This implies that the other two dealers sold 104 − 30 − 28 = 46 cars.

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Re: In 2010, there were four used-car dealers in City Z. The graphic shows [#permalink]
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Re: In 2010, there were four used-car dealers in City Z. The graphic shows [#permalink]
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