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Answer is option 4 (i.e) 400

x+43+17+12+3 = 100
x+75 = 100
x = 25


75% of them are delayed which is equalt to 1200

75/100 * x = 1200

x = 1600

25% are on time

25/100 * 1600 = 400

by kishore

Sat Oct 10, 2009 1:52 pm
Forum: Problem Solving
Topic: Planes
Replies: 1
Views: 701

On one side of a coin there is the number 0 and on the other side the number 1. What is the probability that the sum of three coin tosses will be 2? No of ways sum of three coin tosses will be 2 are 3 011 101 110 Probable totals of three coin tosses will be 8 000 111 010 001 100 110 101 011 Probabil...

by kishore

Sun Feb 01, 2009 1:21 pm
Forum: Problem Solving
Topic: Probability: Total of 3 coin flips
Replies: 2
Views: 1002

If two balls are to be choosen from 3 red balls and 2 white balls, what is the probability of picking at least one white ball?


Answer: probability of picking at least one white ball is

1 - (probability of picking only red ball)

1 - ( 3C2/5C2) = 1- (3/10) = 7/10

by kishore

Sun Dec 28, 2008 8:39 pm
Forum: Problem Solving
Topic: What is the probability of picking at least one white ball
Replies: 4
Views: 18186

I think answer would be 10C4 * 4! = 5040.???


Can you explain how did u come to this conclusion?

by kishore

Sun Dec 28, 2008 8:35 pm
Forum: Problem Solving
Topic: password codes
Replies: 8
Views: 1377

password codes

A software program is designed to generate password codes using alphabet from A to J, how many 4-alphabet password codes can the program generate? (please note: the alphabets are not allowed to repeat itself.)? Answer: A to J there are 10 aplhabets. Each password is 4 digits length. Every time you c...

by kishore

Sun Dec 28, 2008 7:50 pm
Forum: Problem Solving
Topic: password codes
Replies: 8
Views: 1377

How many ways can 3 pieces of candy given out to 4 kids ?

How many ways can 3 pieces of candy given out to 4 kids ?

4C3 = 4!/1! * 3! = 4 ways

Alternative Explanation:

A, B, C, D are the Kids and 3 candies can be distributed among them as

ABC

ABD

ACD

BCD

Therefore it is 4 ways.

by kishore

Sun Dec 28, 2008 7:36 pm
Forum: Problem Solving
Topic: candy
Replies: 4
Views: 911

The number of stamps that Kaye and Alberto had were in the ratio 5:3 respectively. After Kaye gave Alberto 10 of her stamps, the ratio of the number Kaye had to the number Alberto had was 7:5. As a result of this gift, Kaye had how many more stamps than Alberto? C) 40 K:A = 5:3 => K = 5x and A = 3x ...

by kishore

Wed Jul 16, 2008 7:17 pm
Forum: Problem Solving
Topic: GMATPrep Stamps
Replies: 24
Views: 9505

Answer) E = |X|/X If X not equal to Zero, sqrt(X^2)/ X If X = -1 sqrt(X^2)/ X = sqrt ( -1 ^ 2)/ -1 = sqrt(1)/-1 = 1/-1 = -1 If X = 1 sqrt(X^2)/ X = sqrt ( 1 ^ 2)/ 1 = sqrt(1)/1 = 1/1 = 1 So, X can be -1 or + 1 look at the answers if x = -1 => |x|/x = |-1|/-1 = 1/-1 = -1 if x = 1 => |x|/x = |1|/1 = 1...

by kishore

Mon Jul 14, 2008 8:25 pm
Forum: Problem Solving
Topic: GMAT Prep - Number Properties
Replies: 4
Views: 1298

In Company X, 30 percent of the employees live over ten miles from work and 60 percent of the employees who live over ten miles from work are in car pools. If 40 percent of the employees of Company X are in car pools, what percent of the employees of Company X live ten miles or less from work and ar...

by kishore

Mon Jul 14, 2008 8:11 pm
Forum: Problem Solving
Topic: simple but tricky
Replies: 3
Views: 3601

The volume of a box with a square base is 54 cubic centimeters. If the height of the box is twice the width of the base, what is the height, in centimeters? (D) 6 Box is cube volume of cube = L * B * H Since, base of the box is square L = B From question, we know that H = 2 * B If L = B = x => H = 2...

by kishore

Mon Jul 14, 2008 7:55 pm
Forum: Problem Solving
Topic: volume
Replies: 2
Views: 5014

If y > 0, which of the following is equal to sq.48y^3

Answer:
(A) 4y sq. rt. 3y


sqrt(48 * y^3)

= sqrt(16 * 3 * y ^2 * y)

= sqrt(16) * sqrt(3) * sqrt(y ^2) * sqrt(y)
= 4 * sqrt(3) * y * sqrt(y)
= 4y sqrt(3*y)

by kishore

Mon Jul 14, 2008 7:46 pm
Forum: Problem Solving
Topic: square roots
Replies: 1
Views: 1279

Ans) 1/15

Total number of workers = Josua + Jose + 4 = 6

2 people will be interviewed from 6

=> Total outcomes = 6C2

=> Possible outcomes that Josua and Jose are selected = 2C2

Probability = 2C2/6C2 = 1/15

by kishore

Sun Jun 22, 2008 3:49 pm
Forum: Problem Solving
Topic: permutation? probability
Replies: 2
Views: 1048

I guess, right answer is:


(C) Because of many young recruits to the United States work force who are so poorly educated and trained

by kishore

Sat Jun 21, 2008 10:14 pm
Forum: Sentence Correction
Topic: young recruiters..
Replies: 7
Views: 1497

Answer:

(D) Clara Schumann has been a child prodigy, and she


Reason: Pro-Noun should be followed by Noun but not reverse

by kishore

Sat Jun 21, 2008 10:04 pm
Forum: Sentence Correction
Topic: Clara Schumann..
Replies: 4
Views: 1561

No.....it is

nCr = n!/((n-r)! * r!)

5C2 = 5!/(3! * 2!)

XC2 = X!/((X-2)! * 2!)

Substitute X = 6

6C2 = 6!/((6-2)! * 2!)

by kishore

Sat Jun 21, 2008 8:51 pm
Forum: Problem Solving
Topic: Combinatorics
Replies: 4
Views: 1179