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You are here: Home / Official GMAT Guides / 2018 Official GMAT Quantitative Review /

Question 228 Data Sufficiency 2018 GMAT Quantitative Review

Question 228 Data Sufficiency 2018 GMAT Quantitative Review

 
Video explanation[PQID: DS08307]: A total of 20 amounts are entered on a spreadsheet that has 5…

Comments

  1. Tommy says

    September 11, 2020 at 8:14 PM

    What do we do with the information that that ” the average of the amounts in row i is Ri(1<i<5) and the other for Cj? (1<j<4)

    Reply
    • GMAT Quantum says

      September 14, 2020 at 2:51 PM

      We used this information to conclude that $R_1$ is the average of the four entries in the first row and therefore the sum of the four entries in the first row is equal to $4R_1$, we then extend this to the other rows as well, and conclude that the sum of the 20 entries is equal to $4(R_1 + R_2 + R_3 +R_4 + R_5)$. We couldn’t have done this without that piece of information. Later we extend the same logic to the column averages as well in the case of statement 2. I hope this makes sense.

      Reply

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