Search found 139 matches


(1+√3)^1/2 * (1+√3)^1/2 * [1 + (1-√3)]^1/2
(1+√3)^1/2 * [1+√3+1-3]^1/2
(1+√3)^1/2 * (√3-1)^1/2
(3-1)^1/2
√2

by sacx

Thu Aug 20, 2009 2:48 am
Forum: Problem Solving
Topic: simplifying square roots
Replies: 9
Views: 1685

Stmt I

f(2) = 100
a*2 = 100
a = 50

We can find out f(1)

Suff

Stmt II

f(3) = -1000
a*3 = -1000
a = -1000/3

We can find out f(1)

Suff

D

by sacx

Fri Aug 14, 2009 2:08 am
Forum: Problem Solving
Topic: f(n)
Replies: 1
Views: 766

x1 = 3 x2 = 2(3) - 1 = 5 x3 = 2(5) - 1 = 9 x4 = 2(9) - 1 = 17 x5 = 2(17) - 1 = 33 Now we can write the sequence as x1 = 2^1 + 1 x2 = 2^2 + 1 x3 = 2^3 + 1 x4 = 2^4 + 1 x5 = 2^5 + 1 . . . . x19 = 2^19 + 1 x20 = 2^20 + 1 x20 - x19 = 2^20 + 1 - (2^19 + 1) = 2^20 + 1 - 2^19 - 1 = 2^20 - 2^19 = 2^19 (2 - ...

by sacx

Fri Aug 14, 2009 2:02 am
Forum: Problem Solving
Topic: sequence
Replies: 2
Views: 1004

I would have gone for A as well...can someone please help

by sacx

Tue Jul 28, 2009 3:05 am
Forum: Sentence Correction
Topic: car drive
Replies: 11
Views: 1613

My solution: y takes 2t days to complete 2w of work x takes 2(t+2) days to complete 2w.. x+y takes 24/5 days to complete 2w work. and while i created the equation i assumed 2w as 1 unit. so equation will be: 1/2t + 1/(2(t+2)) = 5/24 by solving this i get t = 4, so it takes 6 days for x to produce 2...

by sacx

Wed Jun 10, 2009 3:17 am
Forum: Problem Solving
Topic: work
Replies: 3
Views: 863

yes you are right...it will be 8%

by sacx

Wed Jun 10, 2009 3:12 am
Forum: Problem Solving
Topic: saving
Replies: 3
Views: 863
by sacx

Wed Jun 10, 2009 3:11 am
Forum: Problem Solving
Topic: coin
Replies: 3
Views: 886

I am getting 12 days. did you calculate it for W products of 2W?

y = rate of work for Y and x = rate of work for X

y = W/t
x = W/t+2
x+y = 5W/12

5W/12 = W/t + W/t+2
5/12 = 1/t + 1/t+2

t = 4

y = W/4
x = W/6

Now to produce 2W products, x = 2W/(W/6) = 12 days

by sacx

Wed Jun 10, 2009 2:52 am
Forum: Problem Solving
Topic: work
Replies: 3
Views: 863

Let number of already existing houses = 100
New established = 300

60% of already existing houses = 60
76% of new established houses = 76*3 = 228

total house sold = 228+60 = 288

Percentage = (288/400 ) * 100 = 72%

by sacx

Wed Jun 10, 2009 2:34 am
Forum: Problem Solving
Topic: houses
Replies: 2
Views: 1117

a1 = 2
a2 = 3
a3 = 6 (= t)
a4 = 36
a5 = 2*3*6*36

a5 = 216* t

so answer should be a(n+2) = 216*t

by sacx

Wed Jun 10, 2009 2:29 am
Forum: Problem Solving
Topic: series
Replies: 2
Views: 1029

let y be the total number of students accepted

80% of y = x
y = x *100/80
y = 1.25 x

so college need to accept 1.25 times the number of seats available.

by sacx

Wed Jun 10, 2009 2:21 am
Forum: Problem Solving
Topic: GMATprep: college admissions
Replies: 2
Views: 825

Even I am getting 2

solving the two equations we get x > -3/2 and x < -4/3 and only 2 lies between these two points

by sacx

Tue Jun 09, 2009 7:26 am
Forum: Problem Solving
Topic: number
Replies: 1
Views: 849

total possibilities = 8

HHH
HHT
HTH
THH
TTT
TTH
THT
HTT

same side up = 2 (HHH,TTT)

probability = 2/8 = 1/4

by sacx

Tue Jun 09, 2009 7:22 am
Forum: Problem Solving
Topic: coin
Replies: 2
Views: 966

I am getting 12 people and $298. Don't know where I am going wrong

first person = 1
2nd = 2, 3rd = 4, 4th = 7 and the sequence continues as 11,16,22,29,37, 46,56,67

by sacx

Thu Jun 04, 2009 5:17 am
Forum: Problem Solving
Topic: ap
Replies: 3
Views: 820

When you need to convert Km/hr into m/s multiply it by 5/18

eg: 36 km/hr = 36 *5/18 = 10 mps

When you need to convert m/s to km/hr multiply it by 18/5

eg: 20 m/s = 20 * 18/5 = 72 km/hr

by sacx

Tue Jun 02, 2009 6:27 am
Forum: Problem Solving
Topic: Gmat prep 1 Ques
Replies: 9
Views: 1336