# Simple Arithmetic & Mental Ability/ Expected questions for Competitive examinations.

Simple Arithmetic & Mental Ability is about some model questions that you can expect for competitive examination. Here you can find out practice problems for Maths GK Questions.

SIMPLE ARITHMETIC & MENTAL ABILITY
Expected Questions for Competitive Examinations/ Model Questions
Choose the correct answer from the options given below:

1. The sum of 2 numbers is 72 and the difference is 8. Find the numbers?
A. 38, 34
B. 40, 32
C. 36, 36
2. Which of the following has the largest surface area?
A. Rectangle
B. Triangle
C. Circle
3. A number multiplied by 6 and added to 5 gives 17, find the number?
A. 2
B. 3
C. 4
4. Find the next number: 5, 13, 18, 31, 49, ——–
A. 60
B. 70
C. 80
5. The present age of father and his son are 42 and 10 years. Find the ratio of their ages when father was 35 years old?
A. 3: 35
B. 35: 3
C. 35: 10
6. If 12% of a number is 48, find the number?
A. 300
B. 400
C. 500
7. If the angles of a triangle are in the ratio 2: 3: 4, find the measure of smallest angles?
A. 20 degree
B. 40 degree
C. 60 degree
8. 4 times of a number is same as twice of the same number more than 6. Find the number?
A. 3
B. 4
C. 5
9. Which is greater?
A. 4.5
B. 4.05
C. 4.005
10. If the price of 15 pens is 105 rupees. Find the cost of 25 pens?
A. 150 rupees
B. 175 rupees
C. 185 rupees

1. 40, 32
2. Circle
3. 2
4. 80
5. 35: 3
6. 400
7. 40 degree
8. 3
9. 4.5
10. 175 rupees

Explanation:

1. Let the numbers be x and y
Given x + y = 72 and x – y = 8
Add these equations, 2x = 80
x = 40
Therefore, y = 72 – 40 = 32
2. Circle
3. Let the number be x
Given 6x + 5 = 17
6x = 17 – 5 = 12
x = 12/6 = 2
4. 5
5 + 13 = 18
18 + 13 = 31
31 + 18 = 49
49 + 31 = 80
5. When father was 35 years age, his son’s age will be 3 years
So the ratio is 35: 3
6. 12% of x = 48
12x/100 = 48
12x = 4800
x = 4800/12 = 400
7. Given ratio is 2: 3: 4
Sum of the parts = 2 + 3 + 4 = 9
Measure of each angles are (2/9) x 180 = 40 degree
(3/9) x 180 = 60 degree
(4/9) x 180 = 80 degree
So smallest measure of angle is 40 degree
8. Given 4x = 2x + 6
4x – 2x = 6
2x = 6
x = 6/2 = 3
9. 4.5
10. Cost of 15 pens = 105 rupees
Cost of 1 pen = 105/15 = 7 rupees
Cost of 25 pens = 7 x 25 = 175 rupees