basic maths MCQs – Page 5

Practise focused basic maths questions with marked answers for exam preparation and subject revision.

basic maths Mcqs

81. A cistern has two taps which fill it in 12 min. and 15 min.respectively There is one outlet pipe in the cistern. When all the taps & pipe are opened, the empty cistern is full in 20 min. How long will the waste pipe (outlet) take to empty the full cistern ?
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A. 10 min

B. 40 min

C. 30 min

D. 20 min

82. The mean marks of 30 students in a class is 58.5. Later on it was found that 75 was wrongly recorded as 57. Find the correct them.
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A. 59.1

B. 57.4

C. 57.5

D. 58.9

83. The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years. The ration of the number of boys to the number of girls in the class is___________?
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A. 1:02

B. 2:3

C. 3:04

D. 3:05

84. A salt manufacturing company produced a total of 5000 tonnes of salt in January of a particular year. Starting from February its production increased by 100 tonnes every month over the previous months until the end of the year. Find its average monthly production for that year?
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A. 7070

B. 5550

C. 4440

D. 6060

85. A and B can do a work in 8 days, 13, and C can do the same work in 12 days. A, B and C together can finish it in 6 days. A and C together will do it in_________?
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A. 6 days

B. 12 days

C. 8 days

D. 4 days

86. A man can swim in still water at 4.5 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is_________?
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A. 7.5

B. 2.25

C. 1.5

D. 3

87. A can do a certain work-in the same time in which B and C together can do it. If A and B together could do it in 10 days and C alone in 50 days, then B alone could do it in_________?
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A. 25 days

B. 20 days

C. 30 days

D. 15 days

88. A trader purchased two colour televisions for a total of Rs. 35000. He sold one colour television at 30% profit and the other 40% profit. Find the difference in the cost prices of the two televisions if he made an overall profit of 32%?
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A. Rs. 19000

B. Rs. 21000

C. Rs. 17500

D. Rs. 24500

89. The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is___________?
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A. 35.2

B. 36.1

C. 36.5

D. 39.1

90. To fill a cistern, pipes P, Q & R take 20, 15 & 12 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern is:__________?
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A. 15 min

B. 5 min

C. 20 min

D. 10 min

91. The average of first five prime numbers greater than 20 is____________?
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A. 32

B. 31

C. 32.2

D. 31.01

92. The present average age of a family of five members is 26 years. If the present age of the youngest member in the family is ten years, then what was the average age of the family at the time of the birth of the youngest member ? (Assume no death occurred in the family since the birth of the youngest).
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A. 14 years

B. 16 years

C. 18 years

D. 20 years

93. The current of a stream at 1 kmph. A motor boat goes 35 km upstream and back to the starting point in 12 hours. The speed of the motor boat in still water is_________?
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A. 8.5 kmph

B. 6 kmph

C. 7 kmph

D. 8 kmph

94. The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?
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A. 0

B. 1

C. 19

D. 10

95. The current of a stream runs at the rate of 4 kmph. A boat goes 6 km and back to the starting point in 2 hours, then find the speed of the boat in still water?
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A. 21 kmph

B. 12 kmph

C. 10 kmph

D. 8 kmph

96. The average of 1st 3 of 4 numbers is 16 and of the last 3 are 15. If the sum of the first and the last number is 13. What is the last numbers?
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A. 6

B. 2

C. 8

D. 5

97. X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last ?
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A. 15 days

B. 20 days

C. 6 days

D. 10 days

98. The speed of a boat in still water is 60kmph and the speed of the current is 20kmph. Find the speed downstream and upstream?
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A. 50, 55 kmph

B. 40, 60 kmph

C. 80, 40 kmph

D. 35, 25 kmph

99. The average of first five multiples of 3 is____________?
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A. 15

B. 3

C. 12

D. 9

100. A can do piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ?
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A. 45 days

B. 50 days

C. 70 days

D. 120/7 days

Showing 81 to 100 of 238 mcqs