If the average (arithmetic mean) of the assessed values
of x houses is $212,000 and the average of the assessed
values of y other houses is $194,000, what is the average
of the assessed values of the x+y houses?
(1) x+y=36
(2) x=2y
Here if i put x = 2y in the equation (212000x + 194000y)/(x + y) then y gets canceled and thus we get the average answer.
OA : C, my answer : B
DS
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that was from gmat set
thanks
and please lemme know how to search a post before i post the questions.
I was not able to search the same question when i read the instruction in the forum instead got all the other posts that contains all the words from the question and was cumbersome.....
thanks
and please lemme know how to search a post before i post the questions.
I was not able to search the same question when i read the instruction in the forum instead got all the other posts that contains all the words from the question and was cumbersome.....
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can you simply just replace x=2y into that equation? because the avg of x is sum of x divided by x. In other words what you're referring to x in the denominator isnt the number of x it's the sum of all the x quantities?
Additionally when you take the formula you wrote out 212,000x = 194,000y/x + y, we still dont know what is on the right side of the equal sign? I'm definitely not a math whiz but maybe someone can enlighten me on wheter that is correct or not?
Additionally when you take the formula you wrote out 212,000x = 194,000y/x + y, we still dont know what is on the right side of the equal sign? I'm definitely not a math whiz but maybe someone can enlighten me on wheter that is correct or not?