Permutation and Combination
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A 30% solution of barium chloride is mixed with 10 grams of water to form a 20% solotion. How many grams of original solution did we start with ?
A) 10
B) 15
C) 20
D) 25
E) 30
Written by Take GMAT Team on March 11th, 2010 with 28 comments.
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Three grades of milk are 1 percent, 2 percent and 3 percent fat by volume. If x gallons of 1 percent grade, y gallons of 2 percent grade and z gallons of 3 percent grade are mixed to give x+y+z gallons of 1.5 percent grade, what is x in terms of y and z?
A. y [...]
Written by vibz on December 1st, 2009 with 7 comments.
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In an examination there are three multiple choice questions and each questions has 4 choices. Number of sequences in which students can fail to get all answers correct ?
A) 11
B) 15
C) 63
D) 80
E) 83
Written by Take GMAT Team on January 11th, 2009 with 16 comments.
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The number of different arrangements that can be made with the letters of the word ”GRATITUDE” in which the T’s are together?
A) 9!*2!
B) 8!
C) 9!
D) 81*2!
E) None of these
Written by Take GMAT Team on January 10th, 2009 with 20 comments.
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A vessel is filled with a liquid in which 5 parts are milk and 3 parts are water. What fraction of mixture must be drawn off are replaced with water. So that the mixture may be half water and half milk.
a) 1/2
b) 1/3
c) 2/3
d) 1/5
e) 1/8
Written by Take GMAT Team on December 7th, 2008 with 18 comments.
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At a dinner party, 5 people are to be seated around a circular table. Two seating arrangements are considered different only when the positions of the people are different relative to each other. What is the total nummber of different possible seating arrangements for the group?
(A) 5
(B) 10
(C) 24
(D) 32
(E) 120
Written by Take GMAT Team on September 18th, 2008 with 33 comments.
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How many ways to choose a committee of 3 people from 4 couples so that no couple is chosen.
A) 36
B) 48
C) 210
D) 306
E) None of these
Written by Take GMAT Team on August 1st, 2008 with 10 comments.
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Jake, Lena, Fred, John and Inna need to drive home from a party in a car that can seat 7 people. If only Inna or Jake can drive, how many seat allocations are possible?
a. 30
b. 42
c. 60
d. 120
e. 125
Written by illusions on July 14th, 2008 with 15 comments.
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From a group of 3 boys and 3 girls, 4 children are to be randomly selected. What is the probability that equal numbers of boys and girls will be selected?
Â
A. 1/10
B. 4/9
C. 1/2
D. 3/5
E. 2/3
Written by GHCV on October 12th, 2007 with 4 comments.
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