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Mathematical Series Questions for Competitive Exams

5 months ago 155.7K Views
Q :  

If the differernce between the reciprocal of a positive proper fraction and fraction itself be, then the fraction is:

(A)

(B)

(C)

(D)

Correct Answer : B

Q :  

What is the value of a when ?

(A)

(B)

(C)

(D)

Correct Answer : A

Q :  

If , then x equals

(A) 0

(B) -1

(C) 1

(D)

Correct Answer : B

Q :  

Simplify .

(A) 2

(B) 1

(C)

(D)

Correct Answer : C

Q :  

Two numbers are in the ratio x : y . If 2 is added to both numerator and denominator ,  the fraction becomes . Find the value of x + y . 

(A) 2

(B) 3

(C) 4

(D) 5

Correct Answer : D

Q :  

Which of the following is largest fraction amongst , , ,  ?

(A)

(B)

(C)

(D) None of these

Correct Answer : C

Q :  

Sum of 5 times of a fraction and 4 times its reciprocal is 9. What is fraction?

(A)

(B)

(C)

(D)

Correct Answer : C

Q :  

Find the value of .

(A) 0.002

(B) 0.0002

(C) 0.2

(D) 0.02

Correct Answer : C

Q :  The twice of sum of the ages of a father and his son is 8 times the age of the son. If the average age of the father and the son is 30 years, what is father's age ?

(A) 42 yrs

(B) 45 yrs

(C) 36 yrs

(D) 38 yrs

Correct Answer : B
Explanation :
Answer: B) 45 yrs Explanation: Let father's age be x year and son's age be y year. According to question, 2(x+y) = 8y _______(I) and (x+y)/2 = 30 => x+y = 60 years__________(II) From equation (I) and (II) 8 y = 120 y = 15 years, Hence x = 45 years.

Q :  A batsman has a certain average of runs for 16 innings. In the 17th innings, he makes a score of 85 runs, thereby increasing the average by 3, what is the average before the 17th innings?

(A) 30

(B) 32

(C) 34

(D) 35

Correct Answer : C

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