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Mathematical Operations

Important Instructions
11.

The value of -4-(-10) is how much greater then the value of -10-(-4) ?

Answer: C

-4-(-10) = -4+10 = 6

-10-(-4) = -10+4= -6

Therefore, 6-(-6) = 6+6 = 12

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12.

If – means x, x means +, + means 4, and + means then 40x 12 + 3- 6 + 60 = ?

Answer: D

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13.

If "÷" denotes "multiplied by", "+" denotes "subtracted from", "–" denotes "added to" and "x" denotes "divided by", then which of the following equation is true?

Answer: D

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14.

In a certain code language, '-' represents 'x', '÷' represents '+', '+' represents '÷' and 'x' represents '-'. Find out the answer to the following question.19 ÷ 2 - 35 + 10 x 6 = ?

Answer: A

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15.

If P denotes ÷; Q denotes ×, R denotes + and S denotes –, then what is the value of 18 Q 12 P 4 R 5 S 6 ?

Answer: A

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16.

In the following question, by using which mathematical operator will the expression become correct?
18 ? 6 ? 9 ? 27

Answer: B

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17.

If × means ÷,  - means ×,  ÷ means + and  + means- than (3 - 15 ÷ 19) × 8 + 6 = ?

Answer: C

By the given data, we have  the expression :

(3 × 15 + 19) ÷ 8 - 6 = (45 + 19) ÷ 8 - 6 = 64 ÷ 8 - 6 = 8 - 6 = 2

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18.

If ‘R’ stands for ‘–‘, ‘A’ stands for ‘+’, ‘B’ stands for ‘÷’ and ‘C’ stands for ‘×’, then what is the value of the given equation ?

25 A 37 C 2 B 4 R 1 = ?

Answer: C

According to the question, after putting signs

= 25 + 37 × 2 ÷ 4 – 1 

= 62 × 2 ÷ 4 – 1 

= 124 ÷ 4 – 1 

= 31 – 1 = 30.

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19.

What is x squared plus x squared?

Answer: B

In an algebraic expression, like terms are terms that contain the same variables raised to the same powers. Calculating x-squared plus x-squared is a matter of combining like terms. 

Now x^2 + x^2 = 2x^2

Hence, x-squared plus x-squared is equal to 2 times x squared.

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20.

The following equation is incorrect. Which two signs should be interchanged to correct the equation?

1 ÷ 14 x 30 + 20 - 10 = 12

Answer: D

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