Simple Arithmetic & Mental Ability / Maths GK Questions
Simple Arithmetic & Mental Ability/ Maths GK Questions is about some model questions that you can expect for competitive examinations. Here you can find out Maths GK questions for competitive examinations.
Simple Arithmetic & Mental Ability/ Maths GK Questions
Expected Maths GK Questions for Competitive Examinations
Choose the correct answer:
- If 2/5 of a number is 526, find the number?
A. 2630
B. 1315
C. 1052 - 1000 + 0.001 = ———-
A. 1000.1
B. 1000.01
C. 1000.001 - Convert to decimals: 80%
A. 4/5
B. 3/5
C. 2/5 - Find the cost of fencing a rectangular garden of length 125m and breadth 75m, at the rate of Rs 25 per metre?
A. 5000
B. 10000
C. 15000 - Sum of all angles of a polygon with 10 sides is ——— degree.
A. 1800
B. 1440
C. 720 - Find the odd one out:
A. 8
B. 27
C. 63 - The angle between the hour hand and minute hand of a clock when the clock time is 1 pm?
A.30 degree
B.60 degree
C.90 degree - Average of first 5 odd numbers is?
A.4
B.5
C.6 - Ramu travelled 25m straight towards East. He turned left and travelled 15m straight. Then turned right and travelled 20m straight. Again he turned right and travelled 15 m straight. How far is he from the starting point?
A. 40m
B. 45 m
C. 50 m - If 60% of the students in a school are girls and number of boys is 1250, find the number of girls?
A. 1870
B. 3125
C. 750
ANSWERS:
- 1315
- 1000.001
- 4/5
- 10000
- 1440
- 63
- 30 degree
- 5
- 45m
- 1875
EXPLANATION:
- Let the number be x.
Given 2/5 of x = 526
x = (526 x 5)/2 = 1315 - 1000 + 0.001 = 1000.001
- 80% = 80/100 = 8/10 = 4/5
- Perimeter = 2 (l + b) = 2 (125 +75) = 2 x 200 = 400 m
Cost of fencing = 400 x 25 = 10000 rupees - The sum of angles of a polygon with n sides = (n – 2) x 180
(10 – 2) 180 = 8 x 180 = 1440 degree - 8 and 27 are perfect cubes.
63 is not a perfect cube - 30 degree
- First 5 odd numbers are 1, 3, 5, 7 and 9
Average = (1+ 3 + 5 + 7 + 9)/5 = 25/5 = 5 - 45m
- Given 60% are girls. So the remaining 40% are boys
Let the total number of students be x
Then 40% of x = 1250
i.e., x = (1250 x 100)/40 = 3125
So the number of boys = 3125 – 1250 = 1875