mathematics MCQs – Page 42

Practise multiple-choice questions from mathematics for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

821. In a mixture of milk and water, the proportion of milk by weight was 80%. If, in a 180 gm mixture, 36 gms of pure milk is added, what would be the percentage of milk in the mixture formed?
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A. 87.50%

B. 100%

C. 80%

D. 84%

E. None of these
822. The denominator of a fraction is 1 less than twice the numerator. If the numerator and denominator are both increased by 1, the fraction becomes 3/5. Find the fraction?
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A. 5/9

B. None of these

C. 5-Mar

D. 3-Feb

E. 7-Apr

823. There are some rabbits and peacocks in a zoo. The total number of their heads is 60 and total number of their legs is 192. Find the number of total rabbits?
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A. 40

B. 46

C. 30

D. 44

E. None of these
824. Jameel gets on the elevator at the 11th floor of a building and rides up at the rate of 57 floors per minute. At the same time, Nasir gets on an elevator at the 51st floor of the same building and rides down at the rate of 63 floors per minute. If they continue travelling at these rates, then at which floor will their paths cross?
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A. 30

B. 19

C. 28

D. 37

825. How many 4-letter words with or without meaning, can be formed out of the letters of the word, LOGARITHMS, if repetition of letters is not allowed?
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A. 400

B. 2520

C. 5040

D. 40

826. A runs 1 2/3 times as fast as B. If A gives B a start of 80 m, how far must the winning post be so that A and B might reach it at the same time?
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A. 200 m

B. 300 m

C. 160 m

D. 270 m

827. A man can row at 5 km/hr in still water, if the river is running at 1 km/hr it takes him 75 minutes to row to a place and back. How far is the place?
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A. 5 km

B. 4 km

C. 2.5km

D. 3km
828. 31.2 * 14.5 * 9.6 = ________?
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A. 4243.04

B. 4343.04

C. 4433.04

D. 4334.04

829. A mixture of 150 liters of wine and water contains 20% water. How much more water should be added so that water becomes 25% of the new mixture?
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A. 10 liters

B. 7 liters

C. 15 liters

D. 9 liters

830. 6 of 5/8 / 5/8 1/8 = ______?
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A. 6 3/4

B. 5 7/8

C. 6 1/8

D. 5 3/4

831. (1.9 * 0.021) / (0.095 * 0.105) = ______?
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A. 10

B. 4

C. 5-Jan

D. 20-Jan

832. A group of 10 representatives is to be selected out of 12 seniors and 10 juniors. In how many different ways can the group be selected if it should have at least one senior?
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A. C?? + 1

B. C??

C. C?? 1

D. C? + ?C?

833. A person can row at 9 kmph and still water. He takes 4 1/2 hours to row from A to B and back. What is the distance between A and B if the speed of the stream is 1 kmph?
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A. 25 km

B. None of these

C. 24 km

D. 28 km

E. 32 km

834. Rs.8000 become Rs.9261 in a certain interval of time at the rate of 5% per annum of C.I. Find the time?
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A. 2 years

B. 4 years

C. 3 years

D. 6 years

835. There are 30 people in a group. If all shake hands with one another , how many handshakes are possible?
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A. 29! + 1

B. 870

C. 30!

D. 435
836. A man can row 9 1/3 km/hr in still water and he finds that is thrice as much time to row u p than as to row down the same distance in river. The speed of the current is:________?
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A. 1 km/hr

B. 3 1/3 km/hr

C. 4 2/3 km/hr

D. 3 1/9 km/hr

837. 2222.2 + 222.22 + 22.222 = ________?
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A. 2466.462

B. 2664.642

C. 2466.642

D. 2464.462

838. The cost of Type 1 rice is Rs. 15 per kg and Type 2 rice is Rs. 20 per kg. If both Type 1 and Type 2 are mixed in the ratio of 2 : 3, then the price per kg of the mixed variety of rice is:_______?
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A. Rs. 19.50

B. Rs. 18

C. Rs. 18.50

D. Rs. 19

839. How many four digit numbers can be formed using the digits {1, 3, 4, 5, 7,9}(repetition of digits is not allowed)?
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A. 180

B. 60

C. 360

D. 300

840. A student has to opt for 2 subjects out of 5 subjects for a course. Namely commerce, economics, statistics, mathematics 1 and Mathematics 2, Mathematics 2 can be offered only if mathematics 1 has also opted. The number of different combinations of two subjects which can be opted is_________?
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A. 7

B. 5

C. 18

D. 6