All Free Mathematics MCQs with Answers
Every Mathematics question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
1,551 questions · page 14 of 78
- A. 30 Years
- B. 31 years
- C. 26 years
- D. 33 years
Explanation: The total age of seven persons is 7 × 28 = 196 years. The first three contribute 3 × 21 = 63 years and the last three contribute 3 × 34 =…
Correct answer: 31 years- A. 31
- B. 29
- C. 28
- D. 30
Explanation: In the first 20 matches, the batsman scored 20 × 40 = 800 runs. In the next 10 matches, he scored 10 × 13 = 130 runs, making 930 runs in…
Correct answer: 31- A. 4
- B. 5
- C. 6
- D. 7
Explanation: If the original number of boys is n, their total weight is 30n kg. After the 35 kg boy joins, the total is 30n + 35 kg and the average is…
Correct answer: 4- A. 6060
- B. 7070
- C. 5550
- D. 4440
Explanation: The monthly production forms an arithmetic sequence: January is 5000 tonnes and December is 5000 + 11 x 100 = 6100 tonnes.
Correct answer: 5550- A. Rs. 25
- B. Rs. 18
- C. Rs. 15
- D. Rs. 22
Explanation: After the new member joins, seven members have an average of Rs. 20, so their total amount is 7 x Rs. 20 = Rs. 140.
Correct answer: Rs. 15- A. 180
- B. 170
- C. 190
- D. 175
Explanation: The first two numbers total 2 x 85 = 170, and adding the third number gives 170 + 125 = 295.
Correct answer: 180- A. 194
- B. 174
- C. 162
- D. 186Computer Online Quiz
Explanation: Add the five numbers: 312 + 162 + 132 + 142 + 122 = 870. Dividing by 5 gives an average of 870 / 5 = 174.
Correct answer: 174- A. 22
- B. 24
- C. 12
- D. 8
Explanation: For 10 persons, a decrease of 3 years in the average means the total age decreases by 10 x 3 = 30 years.
Correct answer: 12- A. 72
- B. 45
- C. 37
- D. 79
Explanation: Multiplying every student's marks by 2 multiplies the total marks, and therefore the average, by 2 as well.
Correct answer: 72- A. 22
- B. 27
- C. 25
- D. 29
Explanation: Adding the same value to every observation adds that value to the average. Thus the new average is 23 + 4 = 27.
Correct answer: 27- A. 125
- B. 134
- C. 170
- D. 98
Explanation: When every number is multiplied by 5, the average is also multiplied by 5 because the total is multiplied by 5 while the number of terms…
Correct answer: 125- A. 3000
- B. 2500
- C. 4500
- D. 5000
Explanation: The January-to-April salary total is 4 x Rs. 8000 = Rs. 32,000, while the February-to-May total is 4 x Rs. 8500 = Rs. 34,000.
Correct answer: 4500- A. 50
- B. 47.5
- C. 59
- D. 52.5
Explanation: The first class has total marks 30 x 40 = 1200 marks, and the second has 50 x 60 = 3000 marks.
Correct answer: 52.5- A. 17
- B. 29
- C. 18
- D. 19
Explanation: Let the average after 15 innings be x runs. Then the total before the 16th innings is 15x runs, and after scoring 64 runs the new average…
Correct answer: 19- A. 10
- B. 11.5
- C. 12
- D. 10.5
Explanation: The first 20 natural numbers are 1 through 20, whose average is the midpoint of the first and last terms: (1 + 20) / 2 = 10.5.
Correct answer: 10.5- A. 46
- B. 56
- C. 34
- D. 57
Explanation: The total of 11 results is 11 x 50 = 550, while the first six total 6 x 49 = 294 and the last six total 6 x 52 = 312.
Correct answer: 56277. The average of five results is 46 and that of the first four is 45. The fifth result is__________?
- A. 1
- B. 10
- C. 12.5
- D. 50
Explanation: The five results total 5 x 46 = 230, and the first four total 4 x 45 = 180. Therefore the fifth result is 230 - 180 = 50.
Correct answer: 50- A. 1 year
- B. 1.5 years
- C. 2 years
- D. 2.5 years
Explanation: Three years ago, the six family members had a total age of 6 x 19 = 114 years.
Correct answer: 1 year- A. 55 kg
- B. 62 kg
- C. 56 kg
- D. None
Explanation: Let the original average be x kg, so the 25-person total is 25x kg. After adding a 46 kg person, the 26-person average is x - 5 kg, giving…
Correct answer: None- A. 20
- B. 25
- C. 30
- D. 32
Explanation: If n students were sent up, their total marks were 39n marks. Removing four students removes 5 + 12 + 15 + 19 = 51 marks, and the…
Correct answer: 25