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You are here: Home / Official GMAT Guides / 2018 Official GMAT Guide /

Question 229 Problem Solving 2018 GMAT Official Guide

Question 229 Problem Solving 2018 GMAT Official Guide

 
Video explanation: Of the 150 houses in a certain development 60 percent have…

Comments

  1. Gayatri says

    September 16, 2018 at 12:41 PM

    Why don’t we also take “75 – ( b+c+5)”? Why is 75 taken on its own?

    Reply
    • GMAT Quantum says

      September 17, 2018 at 12:10 AM

      I used 75 only because I need the total count in the three circle collectively. One could add up the individual regions, in which case we will need to add the following terms:

      [75-(b+c+5)] + [45 -(a+c+5)] + [90 – (a+b+5)] + a + b + c + 5 = Total

      You will notice that if I combined the terms [75-(b+c+5)] and b+c+5 (terms in the end above), we would just get 75, and that is what I did in one shot.

      75 + a + [45 -(a+c+5)] + [90 – (a+b+5)] = Total

      They are both equivalent, essentially you are considering one of the full circles to begin with.

      Reply

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