Aptitude and Reasoning Questions

Q:

A and B have to type a book together containing 120 pages. A takes 9 hrs to type 36 pages and B takes 5 hrs to type 40 pages. A typed first 60 pages alone and the last 60 pages were typed by A and B together. How much time (in hours) will be taken to type the complete book?

A) 24 B) 20
C) 12 D) 15
 
Answer & Explanation Answer: B) 20

Explanation:
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Q:

A, B and C can together do a job in 9 days. C alone can do the job in 36 days. In how many days can A and B do 50% of the job working together?

A) 6 B) 12
C) 9 D) 15
 
Answer & Explanation Answer: A) 6

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Q:

Two angles whose sum is 90 are

A) Supplementary angles B) corresponding angles
C) Complimentary angles D) Alternate angles
 
Answer & Explanation Answer: C) Complimentary angles

Explanation:

Complimentary angles are those two angles whose sum is 90 whereas two angles whose sum is 180 are called Supplementary angles.

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Q:

The standard deviation of the set {10, 11, 9, 11, 9} is

A) 1/√5 B) 2/√5
C) 3/√5 D) 0
 
Answer & Explanation Answer: B) 2/√5

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Q:

In a row of books a book of English is 16th from left end of row. A book of Mathematics is 12th from the right end. If the Mathematics book is 6th to the right of the English book, then how many total books are in the row?

A) 33 B) 32
C) 34 D) 31
 
Answer & Explanation Answer: A) 33

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Q:

If a+b=2c then the value of aa-c+cb-c is equal to (where abc)

A) -1 B) 1
C) 0 D) 1/2
 
Answer & Explanation Answer: B) 1

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Q:

In the figure, B and C are the centres of the two circles. ADE is the common tangent to the two circles. If the ratio of the radius of both the circles is 3:5 and AC= 40, then what is the value of DE?

A) 3√15 B) 5√15
C) 6√15 D) 4√15
 
Answer & Explanation Answer: D) 4√15

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Q:

P and Q can do a project in 150 and 100 days respectively. In how many days can they complete 60% of the project if they work together?

A) 12 days B) 72 days
C) 42 days D) 36 days
 
Answer & Explanation Answer: D) 36 days

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