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The average of two numbers is X*Y. If the first number is Y, what is

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Bunuel
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The average of two numbers is X*Y. If the first number is Y, what is [#permalink] New post   11 Oct 2019, 02:30
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The average of two numbers is X*Y. If the first number is Y, what is the other number?

(A) 2XY-Y

(B) XY-2Y

(C) 2XY-X

(D) Z

(E) XY-Y
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A
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Re: The average of two numbers is X*Y. If the first number is Y, what is [#permalink] New post   11 Oct 2019, 04:32
Bunuel wrote:
The average of two numbers is X*Y. If the first number is Y, what is the other number?

(A) 2XY-Y

(B) XY-2Y

(C) 2XY-X

(D) Z

(E) XY-Y


total sum = 2XY
one no is Y
so other no ; 2XY-Y
IMO A
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Abhishek009
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Re: The average of two numbers is X*Y. If the first number is Y, what is [#permalink] New post   11 Oct 2019, 08:06
Bunuel wrote:
The average of two numbers is X*Y. If the first number is Y, what is the other number?

(A) 2XY-Y

(B) XY-2Y

(C) 2XY-X

(D) Z

(E) XY-Y


\(2xy = y + a\) { Where a = Other Number }

SO, \(a = 2xy - y\), Hence Answer must be (A)
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Re: The average of two numbers is X*Y. If the first number is Y, what is [#permalink] New post   12 Oct 2019, 17:13
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Bunuel wrote:
The average of two numbers is X*Y. If the first number is Y, what is the other number?

(A) 2XY-Y

(B) XY-2Y

(C) 2XY-X

(D) Z

(E) XY-Y


Let N denote the other number. We can create the equation:

XY = (Y + N)/2

2XY = Y + N

2XY - Y = N

Answer: A
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Re: The average of two numbers is X*Y. If the first number is Y, what is [#permalink] New post   15 Jan 2021, 08:19
The average of two numbers is X*Y. If the first number is Y, what is the other number?

(A) 2XY-Y

(B) XY-2Y

(C) 2XY-X

(D) Z

(E) XY-Y


let a be the average and z be another no.
y+z = 2a
But average a is xy
y+z = 2xy
z = 2xy - y
A
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Re: The average of two numbers is X*Y. If the first number is Y, what is [#permalink]
15 Jan 2021, 08:19
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