Sol1 :
y = (x+a)(x+b) ==> y = x^2 + (a+b)x + ab ==> to get x intercept assume y = 0
x^2 + (a+b)x + ab = 0
I) a+b = -1, not sure about ab - Insuff
II) Substitute x=0 ==> ab = -6, not sure about a+b - Insuff
I & II) Suff
Answer C
Sol 2:
I) QPR = 30; can't determine PRS - Insuff
II) PQR + PRQ = 150, only gives us QPR = 180 - 150 = 30, Still we can't get PRS - Insuff
I & II) in fact, both I & II are almost exactly same. - Insuff
Answer E
Sol 3:
Get the ratio 1o of concentrate : 3o water = 4o juice
200 * 6o = 1200o of juice to be prepared
1200o Juice = 300o Concentrate : 900o water
Number 12o cans of concentrate = 300 / 12 = 25cans
Answer A
Cheers
Consistently go wrong with this :(..GMAT PREP
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VerbalAttack
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