GMATPrep1: 700 (Q51,V33). ...2nd GMATPrep1: 770 (Q51,V42)

A or B vs. C-trap:

25. If x and y are consecutive odd integers, what is the sum of x and y?
(1) The product of x and y is negative.
(2) One of the integers is equal to –1.
Answer: A

Second condition is obviously insufficient and strongly support first one that seems to be insufficient.
7-t61637 (BTW you were caught by this C-trap )

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What is the perimeter of quadrangle ABCD in which a circle is inscribed?
1) AB+DC=8
2) BC=5
Answer: A

Second condition is obviously insufficient and strongly support first one that seems to be insufficient.
7-t61627

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A startting line up of a team consists of x men and y women. There are also 4 reserve players, 2 of whom are men. If one of the starting players is unable to play and needs to be replaced by one of the reserves, what is the probability that the number of women on the starting team will increase?
1) x+y =12
2) x/y=1/3
Answer: B

the problem depends on the ratio x/y rather than absolute value of x and y. This subtype of C-trap problems is a typical one for %- and average- problems.
7-t61627

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A jewelry dealer initially offered a bracelet for sale at an asking price that would give a profit to the dealer of 40 percent of the original cost. What was the original cost of the bracelet?
(1) After reducing this asking price by 10 percent, the jewelry dealer sold the bracelet at a profit of $403.
(2) The jewelry dealer sold the bracelet for $1,953.
Answer: A

Second condition is obviously insufficient and strongly support first one that seems to be insufficient.
7-t61415