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Basic Operations:

Basic operations in mathematics contain addition,subtractions,multiplications,and division. In basic operations we use the BODMAS rule.


Basic Operations Sample Questions:

Question 1: Which of the following is/are true?


I 13^2 = 169

II 2^8 = 82

III 27^1/3 = 3


(a) II only

(b) I and II only

(c) I and III only

(d) None

Answer: (c)

Explanation: Simplify and check.


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Question 2: The average age of 20 students is A and the average  age of 15 students is B. What is the average of the two numbers?


(a) 4A+3B

(b) (A+B)/35

(c) (4A+3B)/7

(d) 20A+15B

Answer: (c)

Explanation: Let the sum of ages of 20 students be S^1 and the sum of ages of 15 students be S^2.


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Question 3: Ishika creates the base of a picture frame of dimension 4.5m × 6.5m of red fabric. If the cost of fabric is $5 per m2. Calculate the total money spent on making a frame?


(a) $146.75

(b) $146.25

(c) $146.50

(d) $146

Answer: (b)

Explanation: Area of picture frame = 4.5m × 6.5m = 29.25m^2


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Question 4: John draws a rectangle with a length of 8cm. He draws a second rectangle with a length of 11cm. John continued drawing more rectangles, where for each rectangle drawn he used a length of 5cm more than the previous rectangle. If these patterns continue, what will be the length of the 12th rectangle?


(a) 62

(b) 71

(c) 66

(d) 56

Answer: (a)

Explanation: Since the length of the first rectangle is 8cm and the length of the second rectangle is 11cm. Now, the length of the third rectangle is 11+5=16cm, and continues adding 5cm to the previous one.


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Question 5: Tina ran 12 laps everyday. In how many days does she complete 300 laps?


(a) 20 days

(b) 30 days

(c) 25 days

(d) 15 days

Answer: (c)

Explanation: Number of days to complete 12 laps = 1days
Therefore, number of days to complete 300 laps = 1/12 x 300


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Question 6: Simplify:


Question 6

Answer: (a)

Explanation: Explanation 6


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Question 7: A man walks at the speed of 12 km per hour. How much time does he take to cover 78 km?


(a) 6 hours

(b) 7 hours

(c) 8 hours

(d) 6.5 hours

Answer: (d)

Explanation: Use the formula Time = Distance/Speed


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Question 8: If ‘÷’ means ‘×’, ‘+’ means ‘÷’, ‘-’ means ‘+’, ‘×’ means ‘-’, then solve 8+4÷3-5×6 =?


(a) 5

(b) 15

(c) 14

(d) 6

Answer: (a)

Explanation: Change the sign accordingly and simplify.


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Question 9: Simplify:


Question 9


(a) 80

(b) 80.25

(c) 80.75

(d) 81

Answer: (b)

Explanation: Use the BODMAS.


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Question 10: In a farm, there are some cows and hens. If there are a total 35 heads and 110 legs, how many cows and hens are there?


(a) 20 cows & 15 hens

(b) 15 cows & 20 hens

(c) 25 cows & 10 hens

(d) 10 cows & 25 hens

Answer: (a)

Explanation: Let the number of cows be x.
And, the number of hens will be y.
Number of legs of cow = 4x
 Number of legs of hen = 2y


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