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### 6 Cards in this Set

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 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)