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# If r = (x+y)/2 and s = (x-y)/2, what is the value of r + s?

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Math Expert
Joined: 02 Sep 2009
Posts: 46047
If r = (x+y)/2 and s = (x-y)/2, what is the value of r + s? [#permalink]

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11 Nov 2017, 07:39
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Difficulty:

35% (medium)

Question Stats:

68% (00:27) correct 32% (00:34) wrong based on 31 sessions

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If r = (x+y)/2 and s = (x-y)/2, what is the value of r + s?

(1) y = 4

(2) x = 6

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Re: If r = (x+y)/2 and s = (x-y)/2, what is the value of r + s? [#permalink]

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11 Nov 2017, 07:55
Bunuel wrote:
If r = (x+y)/2 and s = (x-y)/2, what is the value of r + s?

(1) y = 4

(2) x = 6

$$r=\frac{x+y}{2}$$ and $$s=\frac{x-y}{2}$$ add the two equations

so $$r+s=\frac{x+y+x-y}{2} = x$$

so we need the value of $$x$$.

Statement 1: Insufficient

Statement 2: Sufficient

Option B
Re: If r = (x+y)/2 and s = (x-y)/2, what is the value of r + s?   [#permalink] 11 Nov 2017, 07:55
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