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 59 of 78
- A. 245
- B. 125
- C. 485
- D. 845
Explanation: Since 5 plants remain for rows of 6, 8, 10 and 12, the number minus 5 must be a multiple of LCM(6, 8, 10, 12) = 120.
Correct answer: 8451162. The sum of the square of the three consecutive even natural numbers is 1460. Find the numbers?
- A. 18, 20, 22
- B. 20, 22, 24
- C. 22, 24, 26
- D. 24, 26, 28
Explanation: The sum for 20, 22, and 24 is 20² + 22² + 24² = 400 + 484 + 576 = 1460.
Correct answer: 20, 22, 24- A. Al-Khwarizmi
- B. Aristotle
- C. Herodotus
- D. Isaac Newton
Explanation: Isaac Newton is commonly called one of the fathers of calculus because he developed differential and integral methods independently of…
Correct answer: Isaac Newton- A. 45 hours
- B. 47 hours
- C. 48 hours
- D. 50 hours
Explanation: The basic hourly rate is Rs. 20 / 40 hours = Rs. 0.50 per hour, so the overtime rate is Rs. 0.50 x 1.25 = Rs. 0.625 per hour.
Correct answer: 48 hours- A. 12
- B. 15
- C. 22
- D. 20
Explanation: P's rate is 1/15 job per day and Q's rate is 1/10 job per day. In 2 days they complete 2/15 + 2/10 = 1/3 of the job, leaving 2/3; P takes…
Correct answer: 12- A. 70
- B. 50
- C. 40
- D. 60
Explanation: Together, A and B complete 20 days x 1/30 job per day = 2/3 of the job in 20 days.
Correct answer: 60- A. 18 days
- B. 22 ½ days
- C. 24 days
- D. 26 days
Explanation: If B's rate is r jobs per day, A's rate is 3r jobs per day, so their times are 1/r days and 1/(3r) days.
Correct answer: 22 ½ days- A. 3 hrs.
- B. 4 hrs,
- C. 5 hrs.
- D. 6 hrs.Education
Explanation: Tap X fills 1/10 tank per hour and tap Y fills 1/15 tank per hour. Together their rate is 1/10 + 1/15 = 1/6 tank per hour, so the filling…
Correct answer: 6 hrs.Education- A. 12 days
- B. 14 days
- C. 16 days
- D. 18 days
Explanation: Since 3 men and 4 women do the same work in 43 days, 4 women have the work rate of 3 men, so one woman equals 3/4 of a man's rate.
Correct answer: 12 days- A. 1.8 days
- B. 1.5 days
- C. 1.2 days
- D. 1 day
Explanation: Six men working for 2 days provide 6 x 2 = 12 man-days to make 10 sofas, so each sofa requires 12/10 = 1.2 man-days.
Correct answer: 1.2 days- A. 1
- B. 5
- C. 10
- D. 25
Explanation: The original task uses 10 workers x 10 days = 100 worker-days to make 10 tables, so each table requires 10 worker-days.
Correct answer: 10- A. 2 men
- B. 12 men
- C. 9 men
- D. 18 men
Explanation: The total work is 6 men x 9 days = 54 man-days. To finish the same 54 man-days in 3 days requires 54/3 = 18 men.
Correct answer: 18 men- A. Rs.1104
- B. Rs.1000
- C. Rs.934
- D. Rs.1210
Explanation: Let one goat's daily cost be g rupees, so one cow's daily cost is 5g rupees.
Correct answer: Rs.1104- A. 50
- B. 30
- C. 40
- D. 13
Explanation: Let a man's rate be m jobs per day and a woman's rate be w jobs per day.
Correct answer: 40- A. 10 days
- B. 14 days
- C. 15 days
- D. 9 days
Explanation: P's rate is 1/20 job per day, while Q and R add 1/30 + 1/60 = 1/20 job per day on every third day.
Correct answer: 15 days- A. 10 min
- B. 20 min
- C. 30 min
- D. 40 min
Explanation: For the first 10 minutes, the two pipes fill 10 x (1/20 + 1/60) = 10/15 = 2/3 of the tank.
Correct answer: 20 min- A. 15 days
- B. 14 days
- C. 16 days
- D. 30 days
Explanation: A is three times as efficient as B, so A's time is one-third of B's time.
Correct answer: 15 days- A. 6 days
- B. 8 days
- C. 10 days
- D. 12 days
Explanation: If one man's rate is m jobs per day, each child's rate is m/2 jobs per day because a child takes twice as long.
Correct answer: 12 days1179. 15 men can build a 500m long wall in 30 days. In how many days can 30 men build a 1.2 km long wall?
- A. 48 days
- B. 24 days
- C. 40 days
- D. 36 days
Explanation: The work is proportional to wall length and the number of man-days. For 500 m, the work is 15 men x 30 days = 450 man-days, so for 1,200…
Correct answer: 36 days- A. 24 days
- B. 14 days
- C. 15 days
- D. 20 days
Explanation: The total work is 28 men x 15 days = 420 man-days. Therefore, 21 men need 420 man-days ÷ 21 men = 20 days.
Correct answer: 20 days