Source: Official Guide for the GMAT 13th Ed. Problem Solving; #131 Official Guide for the GMAT 2015 14th Ed. Problem Solving; #131
SONIKA VASANTH
David had 3 times as many as Jeff How did we get 1/3rds for Jeff and Paula can have 1d when David have half of it I am bit confused. Please guide
Thanks in advance:)
Dec 8, 2016 • Comment
Cydney Seigerman, Magoosh Tutor
Hi Sonika :)
Good questions! We're describing the number of books for the three in terms of the number of books that David has, d.
Let's say that Jeff has j number of books. Since David has three times as many books as Jeff,
3j = d
Now, let's solve for j to describe the number of books Jeff has in terms of d:
3j = d j = (1/3)d
We can check this is correct using actual values. Let's say that David has 12 books, which means that Jeff has 4 books:
j = (1/3)d j = (1/3)*12 j = 4
Dec 9, 2016 • Reply
Mike McGarry, Magoosh Tutor
Dec 28, 2013 • Comment
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