Search found 28 matches
well, I believe answer is E equation for line K is y = ax + b statement 1 means that for y = 0, ax + b = 0 and x = -b/a > 1 but we do not know the values for a and b therefore we cannot state if the line intersects the circle. Statement 1 is not sufficient alone. statement 2 says that a = -1/10, mea...
- by szapiszapo
Wed Jul 02, 2008 7:24 am- Forum: Data Sufficiency
- Topic: DS gprep
- Replies: 1
- Views: 1436
answers to Q1 are 1 and 7 Conventions used: John = J Kate = K xJ1 = 6 xJ2 = 2 xK1 = -7 xK2 = -1 c' = incorrect value for C b' = incorrect value for B The wording tells us that: axJ^2 + bxJ + c' = 0 (equation 1) axK^2 + b'xK + c = 0 (equation 2) while we need to find x1 and x2 satisfying the quadrati...
- by szapiszapo
Wed Jul 02, 2008 6:40 am- Forum: Problem Solving
- Topic: Quant Q - Help me solve these problems
- Replies: 5
- Views: 2049
wording is:
R = 1 + 1/3 + 1/9 + 1/27
S = 1 + 1/3 * r
I just replace R in the equation forming S
therefore
S = 1 + 1/3 * ( 1 + 1/3 + 1/9 + 1/27)
S = 1 + 1/3*1 + 1/3*1/3 + 1/3*1/9 + 1/3*1/27
S = 1 + 1/(3*1) + 1/(3*3) + 1/(9*3) + 1/(27*3)
S = 1 + 1/3 + 1/9 + 1/27 + 1/81
S - R equals 1/81
- by szapiszapo
Wed Jul 02, 2008 4:18 am- Forum: Problem Solving
- Topic: Fractions
- Replies: 3
- Views: 1681
well... depends what you mean by calculation
R = 1 + 1/3 + 1/3 + 1/9 + 1/27
S = 1 + 1/3 * r
then S = 1 + 1/3 + 1/9 + 1/27 + 1/81
visually, we see that S exceeds R by 1/81, i.e. answer E
- by szapiszapo
Wed Jul 02, 2008 1:52 am- Forum: Problem Solving
- Topic: Fractions
- Replies: 3
- Views: 1681
I believe the answer is E (i.e.100) The wording states that : - you have 10 members, out of which 4 are French teachers and 6 are either teaching German or Spanish. - we need to build a 3-member committee with at least 1 French teacher. Therefore you can have committees with 1, 2 or 3 French teacher...
- by szapiszapo
Wed Jul 02, 2008 12:45 am- Forum: Problem Solving
- Topic: gprep questn
- Replies: 3
- Views: 1682
Answer is E (i.e. 6/7)
We know from the wording that
a2 = 2*a1
a3 = 2*a2
a4 = 2*a3
and so on
thus a5 = 2*a4 = 2*2*a3 = 2*2*2*a2 = 8*a2
We also know from the wording that
a5 - a2 = 12
replacing a5 by 8*a2 gives us
a2 = 12/7
now, with a2 = 2*a1, we find a1 = 6/7
- by szapiszapo
Wed Jul 02, 2008 12:16 am- Forum: Problem Solving
- Topic: GMATprep PS question
- Replies: 1
- Views: 1324
Answer is D at t=0 year, height = 4 feet at t=1 year, height = 4 feet + x (x being the constant yearly amount) at t=2 years, height = 4 feet + 2x at t=3, .... ... at t=6, height = 4 + 6x We know that at the end of the 6th year, the tree was 1/5 taller than it was at the end of the 4th year therefore...
- by szapiszapo
Tue Jul 01, 2008 12:54 pm- Forum: Problem Solving
- Topic: GMAT Prep: Number Properties
- Replies: 18
- Views: 9053
Not so sure but I would say that answer is A (statement 1 sufficient, statement 2 not sufficient) cA = cost in state A = p1(1+t1) cB = cost in state B = p2(1+t2) check on condition 2: cA > cB translates into p1(1+t1)>p2(1+t2) i.e. p1+p1t1 > p2+p2t2 i.e. p1t1 > p2t2 + (p2-p1) (p2-p1) is different fro...
- by szapiszapo
Tue Jul 01, 2008 12:29 pm- Forum: Problem Solving
- Topic: DS
- Replies: 1
- Views: 1512
A does the job in x hours, meaning that his rate is rA = 1 / x B does the job in y hours, meaning that his rate is rB = 1 / y In z hours (the time needed to complete the job), A will have performed z / x of the job and B will have performed z / y of the job therefore z/x + z/y = 1 job, i.e. z = xy /...
- by szapiszapo
Tue Jul 01, 2008 11:56 am- Forum: Problem Solving
- Topic: Work rates - fraction of a job
- Replies: 3
- Views: 5182
I believe it's 133
the minimum ratio of 3/80 means that you can have 3 assistants for 80 students max, i.e. 1 assistant for 80/3 students max.
For 5 assistants, you can therefore have at maximum 5*80/3 = 133,33 students, hence 133 seems the appropriate answer
- by szapiszapo
Tue Jul 01, 2008 9:22 am- Forum: Problem Solving
- Topic: GMATprep PS question
- Replies: 14
- Views: 2451
total population = 132,000 11 voting districts named D1, D2, D3, ..., D11 we know that D1 + D2 + D3 + ... + D11 = 132,000 (a) and that the maximum gap between all districts is 110% in terms of population count, i.e. Di <= 1.1 Dj (b) the minimum possible population for a given district is the one for...
- by szapiszapo
Tue Jul 01, 2008 9:14 am- Forum: Problem Solving
- Topic: gprep
- Replies: 4
- Views: 1962
Problem 1 let's assume the following: r1 = speed from Home to Airport = 30 mph r2 = speed from Airpot to Office = 60 mph d = total distance = 150 miles = d1 (Home - Airport) + d2 (Airport - Office), hence d1 = d -d2 t = total time = 3 hours = t1 +t2 we know fron basic physics that r1 = d1 / t1 and ...
- by szapiszapo
Tue Jul 01, 2008 7:48 am- Forum: Problem Solving
- Topic: need help in solving distance word problems
- Replies: 2
- Views: 1334
I believe the answer to Q1 is c). First idea is that you have 4 different representations of a right triangle with the right angle being at P. Indeed, PR is parallel to X axis but either xP <xR> xR. Similarly for the Y axis, xP <xQ> xQ. For a given triangle representation (hereunder defined by xP<XR...
- by szapiszapo
Tue Jul 01, 2008 6:34 am- Forum: Problem Solving
- Topic: GMAT Qs
- Replies: 22
- Views: 5691