GMATPREP questions...... interesting... explinations plzz

[givinggmat]

1. Circle C and line k lie in the XY plane. If the circle C is centered at the origin and has radius 1, does line K intersect circle C?

i) The X-intercept of line K is greater than 1
ii) The sope of line k is -1/10

2. If w+x < 0, is w-y > 0?

i) x + y < 0
ii) y < x < w


3. Rasheed bought two kinds of candy bars, chocolate and toffee, that came in packages of 2 bars each. He handed out 2/3 of the chocolate bars and 3/5 of the toffee bars. How many packages of chocolate bars did rasheed buy?

i) Rasheed bought 1 fewer package of chocolate bars than toffee bars
ii) Rasheed handed out the same number of each kind of candy bar.

[kssshah]

is the OA E, D and C respectively?

[givinggmat]

OA --> E B C are the answers.... explinations anyone...!!

[kssshah]

1. Slope and Y intercept is sufficient for equation of a line but Slope and X intercept will not suffice. So neither of them suffice to answer the question.

2. Okay so i reevaluated and i think i know the reasoning. Provided info w+x <0. Asked for w-y>0. w-y is greater than 0 in 2 situations - either w>y or y is -ve.

Statement 1, does not provide any relational value between w and y. It states x+y < 0, this could mean y be +ve or -ve. So info not sufficient.
Statement 2, provides relation between w,x and y. Since W is the largest number, it suffices one of the required situation i.e. W>Y and hence is sufficient.
Therefore, B.

3. Assume Rasheed bought C chocolate bars and T toffee bars. So per #1, C+1 = T. two variables and one equation. not sufficient. Per #2, 2/3C = 3/5T. Solving #2 still simplifies the relation between C and T. So #2 is not solely sufficient. Now consider both #1 and #2 together. Yes there are 2 equations and we can solve both to find the # of chocolate and toffee packages bought. So the answer is C.

[Attack]

1.Check out the images attached. self explanatory.
answer is hence E.


2. Given that W+X<0
hence either or both of them is negative. (Hmm.. it should be either or both of them is negative OR either or both of them are negative. Thats a verbal q, someone help me )

I is insufficient. as we dont know which of them is negative.
II. X< W hence from the equation in question stem we can conclude that X is definitely negative.
Hence Y is also negative as Y< X.
We have W as either negative or positive, and Y is definitely negative. and Y< W
Hence W-Y is always positive.
SO II is sufficient.
answer is B.

3.
I is insufficient as we cant deduce anything out of it.
II
We have 2/3 C = 3/5 T
hence C= 0.9 T
Insufficient.
Combining, we get C=10 and T=9 packets.
or c=20 AND t=18
Hence answer is C.