GRE-Math-Questions-to-Know-by-Test-Day-2nd-Edition_pag18

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 1. (C) Factor )(57 24 from Quantity A and then simplify. Quantity A equals 
) ) ) )( ( ( (= =
1
3
57
1
3
57 57 19 5725 24 24. The two quantities are equal. Select (C).
 2. (A) A shortcut for finding the time it will take Satya and Jordan to do 
the job working together is to divide the product of their times working 
alone by the sum of their times working alone. Thus, Quantity A = 
) )
) )
( (
( (
) )( (
+
=
+
=
≈
Satya’s time working alone Jordan’s time working alone
Satya’s time working alone Jordan’s time working alone
5 4
5 4
20
9
2.2 hours, which is greater than 2 hours (Quantity B). Select (A).
 3. (B) Given that a, b, c, and d are all positive, a 
c d
1 1
, and, thus, >
b
c
b
d
, which is equivalent to