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How many pages does todays newspaper consist of?

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by VJesus12 » Thu Mar 01, 2018 5:37 am
How many pages does today's newspaper consist of?

(1) Yesterday's paper and today's papers have a total of 66 pages.
(2) Yesterday's paper has three fewer pages than twice today's paper.

The OA is C.

I don't know how can I use both statements to get an answer. Experts, can you help me? Please. <i class="em em-pray"></i>
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Source: — Data Sufficiency |
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by mbawisdom » Tue Mar 06, 2018 11:27 am
VJesus12 wrote:How many pages does today's newspaper consist of?

(1) Yesterday's paper and today's papers have a total of 66 pages.
(2) Yesterday's paper has three fewer pages than twice today's paper.

The OA is C.

I don't know how can I use both statements to get an answer. Experts, can you help me? Please. <i class="em em-pray"></i>
Y = pages in yesterday's paper
T = pages in today's paper

(1) Y + T = 66 --> not sufficient as we do not know Y
(2) Y = 2T - 3 --> not sufficient as we do not know Y

Together: solve simultaneously (you don't need to do this step but for the sake of completeness the solution is below)

put Y from (2) into (1) then solve for T:
Y + T = 66
2T - 3 + T = 66
3T - 3 = 66
3T = 69
T = 23
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