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6 Cards in this Set
- Front
- Back
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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. |
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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 |
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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 |
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On the GMAT, all numbers are integers.
Is the sentence above correct? |
NO!
THE QUESTION MUST MENTION THAT THE NUMBERS ARE INTEGERS! |
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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 |
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if
x2 = y2 so x2 - y2 = 0 then x - y = 0 |
WRONG
x can be 1 or -1 (for instance) |
