A. (mb – nc)/ (m + n) years
B. (mb + nc)/ (m – n) years
C. (mb + nc)/ (m + n) years
D. (mb – nc)/ (m – n) years
✅ The correct answer is option C. (mb + nc)/ (m + n) years.
Mathematics MCQs
There are 21 poles with a constant distance between each pole. A car takes 30 seconds to reach the 16th pole. How long does it take to reach the last pole?
A. 39 seconds
B. 40 seconds
C. 39.38 seconds
D. 39.5 seconds
✅ The correct answer is option B. 40 seconds.
The first pole is crossed at the zeroth second. The timer starts after the car crosses the first pole. Let the distance between each pole be x m. To reach the 16th pole, the distance travelled by the car is 15x. The speed of the car is 15x/30 = x/2 m/s To reach the 21st pole, it has to travel a distance of 20x. Time taken
The first pole is crossed at the zeroth second. The timer starts after the car crosses the first pole. Let the distance between each pole be x m. To reach the 16th pole, the distance travelled by the car is 15x. The speed of the car is 15x/30 = x/2 m/s To reach the 21st pole, it has to travel a distance of 20x. Time taken
= 20x÷(x/2)
= 40 seconds
The diameters of two spheres are in the ratio 1:2 what is the ratio of their volumes?
A. 3:4
B. 9:16
C. 1:8
D. 4:3
✅ The correct answer is option C. 1:8.
The length of a rectangular plot is increased by 25%. To keep it’s area uncharged the width of the plot should be___________?
A. Kept unchanged
B. Increased by 25%
C. Increased by 20%
D. Reduced by 20%
✅ The correct answer is option D. Reduced by 20%.
Masood invests a part of Rs. 12000 in 12% stock at Rs. 120 and the remainder in 15% stock at Rs. 125. If his total dividend per annum is Rs. 1360, how much does he invest in 12% stock at Rs. 120?
A. Rs. 4500
B. Rs. 6000
C. Rs. 5500
D. Rs 4000
✅ The correct answer is option D. Rs 4000.
Let investment in 12% stock is Rs. x.
Let investment in 12% stock is Rs. x.
investment in 15% stock Rs. (12000 – x).
P, Q and R can do a work in 20, 30 and 60 days respectively. How many days does it need to complete the work if P does the work and he is assisted by Q and R on every third day?
A. 10 days
B. 14 days
C. 15 days
D. 9 days
✅ The correct answer is option C. 15 days.
I. a2 + 8a + 16 = 0, II. b2 – 4b + 3 = 0 to solve both the equations to find the values of a and b?
A. If a < b
B. If a ≤ b
C. If the relationship between a and b cannot be established
D. If a > b
✅ The correct answer is option A. If a < b.
I. (a + 4)2 = 0 => a = -4
I. (a + 4)2 = 0 => a = -4
II.(b – 3)(b – 1) = 0
=> b = 1, 3 => a < b
There are four prime numbers written in ascending order of magnitude. The product of the first three is 385 and of the last three is 1001. Find the fourth number?
A. 5
B. 7
C. 11
D. 13
✅ The correct answer is option A. 5.
A man rows his boat 85 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?
A. 5 kmph
B. 6 kmph
C. 7 kmph
D. 8 kmph
✅ The correct answer is option D. 8 kmph.
The length of a rectangular plot is 4 ½ times that of its breadth. IF the area of the plot is 200 square meters, then what is it’s length?
A. 25m
B. 30m
C. 44m
D. None of these
✅ The correct answer is option B. 30m.