In Green Glen Layout last July, what was the average (arithmetic mean) home sale price? (1) In Green Glen Layout last July, there were 100 homes sold for a total of $51 million. (2) In Green Glen Layout last July, condominiums accounted for 60% of the home sales, and the average condominium price was $450,000.
Options:
A .  
if the question can be answered by using any of the
statements alone but not by using the other statement alone.
B .  
if the question can be answered by using either of
the statements alone.
C .  
if the question can be answered only by using both
the statements together.
D .  
if the question cannot be answered
Answer: Option D : D A suitable rephrase of this question is "What was thesum of the homes sale prices, and how many homes were sold?” Statement (1):Insufficient Seems SUFFICIENT as this statement tells us the sum of the home sale prices and the number of homes sold. Thus, the average home price is 51,000,000/100=510,000. But we are not sure how many homes were there overall (may be more than 100). So INSUFFICIENT. Statement (2) INSUFFICIENT: This statement tells us the average condominium price, but not all of the homes sold in Green Glen Layout last July were condominiums. From this statement, we don't know anything about the other 40% of homes sold in Green Glen Layout, so we cannot calculate theaverage home sale price We have some information about the ratio of number of condominiums to noncondominiums sold, 60%:40%, or 6:4, or 3:2, which could be used to pick working numbers for the total number of homes sold. However, the average still cannot be calculated because we don't have any information about the non-condominium prices.
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