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Mathematical Series Questions for Competitive Exams

5 months ago 155.7K Views
Q :   A can contain a mixture of two liquids A and B in the ratio 7: 5. When 9 litres of a mixture are drawn off and the can is filled with B, the ratio of A and B becomes 7: 9. How many litres of liquid A was contained by the can initially?

(A) 11

(B) 10

(C) 21

(D) 23

Correct Answer : C

Q :  In what ratio must at tea at Rs. 62 per kg be mixed with tea at Rs. 72 per kg so that the mixture must be worth Rs. 64.50 per kg?

(A) 3 : 1

(B) 4 : 2

(C) 5 : 3

(D) 2 : 3

Correct Answer : A

Q :  

Alcohol and water in two vessels A and B are in the ratio 5:3 and 5:4 respectively. In what ratio, the liquid of in both the vessels be mixed to obtain a new mixture in vessel C in the ratio 7:5?

(A) 2:3

(B) 3:2

(C) 3:5

(D) 2:5

Correct Answer : A

Q :  

A mixture of 40 liters of milk and water contains 30% water. How much milk should be added to this mixture so that the new mixture contains 80% milk?

(A) 20

(B) 10

(C) 15

(D) 35

(E) 25

Correct Answer : A

Q :  

An alloy contains zinc, copper and tin in the ratio 2:3:1 and an other contains copper, tin and lead in the ratio 5:4:3. If equal weights of both alloys are melted together to form a third alloy, then the weight of lead per kg in the new alloy will be.

(A) ½ kg

(B) 1/8 kg

(C) 3/14 kg

(D) 7/9 kg

Correct Answer : B

Q :  What would be the compound interest obtained on an amount of Rs.1250 at the rate of 8 percent per annum after 2 years?

(A) Rs.200

(B) Rs.208

(C) Rs.212

(D) Rs.220

(E) None of these

Correct Answer : B

Q :  Find the difference between SI and CI for three years at 10% per annual rate on Rs 4000

(A) Rs 125

(B) Rs 126

(C) Rs 124

(D) Rs 127

(E) None of these

Correct Answer : C

Q :  What amount of compound interest can be obtained on the principal amount of Rs. 15800 at the rate of 6 percent per annum at the end of 2 years?

(A) Rs 1,896

(B) Rs.2012.48

(C) Rs. 1952.88

(D) Rs.1,956

(E) None of these

Correct Answer : C

Q :  Sudhanshu invested Rs.15,000 at interest 10 percent at per annum for one year. If the interest is compounded every six months what amount will Sudhanshu get at the end of the year?

(A) Rs. 16,537.50

(B) Rs.16,500

(C) Rs. 16,525.50

(D) Rs.18,150

(E) None of these

Correct Answer : A

Q :  What will be compound interest-on, a sum of Rs 1000 at die rate of 10 percent per annum after 5 year?

(A) Rs 610.51

(B) Rs 559.45

(C) Rs 665.50

(D) Rs 665.51

(E) None of these

Correct Answer : A

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