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How many more first-time jobless claims were filed in week P than in

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How many more first-time jobless claims were filed in week P than in  [#permalink]

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New post 01 Jul 2018, 21:45
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  35% (medium)

Question Stats:

84% (00:49) correct 16% (00:33) wrong based on 19 sessions

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How many more first-time jobless claims were filed in week P than in week T ?

(1) For weeks P, Q, R, and S, the average (arithmetic mean) number of first-time jobless claims filed was 388,250.

(2) For weeks Q, R, S, and T, the average (arithmetic mean) number of first-time jobless claims filed was 383,000.

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Re: How many more first-time jobless claims were filed in week P than in  [#permalink]

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New post 01 Jul 2018, 22:03
Bunuel wrote:
How many more first-time jobless claims were filed in week P than in week T ?

(1) For weeks P, Q, R, and S, the average (arithmetic mean) number of first-time jobless claims filed was 388,250.

(2) For weeks Q, R, S, and T, the average (arithmetic mean) number of first-time jobless claims filed was 383,000.


We'll write our data as equations so we understand what we need to do.
This is a Precise approach.

(1) so (P+Q+R+S)/4 = 388,250.
As we're asked to find P - T, this is not enough.
Insufficient.

(2) so (Q+R+S+T)/4 = 383,000.
Similarly to the above, we cannot isolate P - T from this equation alone.
Insufficient.

Combined:
Subtracting the two equations gives us (P - T)/4 = 5,250 --> P - T = 21,000
Sufficient.

(C) is our answer.
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Re: How many more first-time jobless claims were filed in week P than in &nbs [#permalink] 01 Jul 2018, 22:03
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