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6 Cards in this Set

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  • Back
When is an integer divisible by:

a) 4

b) 6

c) 9
a) when the sum of the last two digits is a multiple of 4.

b) when it is a multiple of 2 and 3.

c) when the sum of the digits is a multiple of 9.
What's the fraction expression for:

a) 12 1/2 %

b) 16 2/3%

c) 33 1/3 %

d) 0,375
a) 1/8

b) 1/6

c) 1/3

d) 3/8
What is the best way to solve:
After an increase of 20% on prices, sales decreased 10%. What is the percentage increase on sales?
One single operation:

(120/100)x(90/100)

= 108/100 = 8% increase
On the GMAT, all numbers are integers.

Is the sentence above correct?
NO!

THE QUESTION MUST MENTION THAT THE NUMBERS ARE INTEGERS!
Playing with average's formula I:

AVG = Sum of Terms / # of Terms

so...
Sum of Terms = AVG x # of Terms

AND

# of Terms = Sum of Terms / AVG
if
x2 = y2 so x2 - y2 = 0

then x - y = 0
WRONG

x can be 1 or -1 (for instance)