Mathematical Operations Questions

Q:

Find out the two signs to be interchanged for making following equation correct

5 + 3 x 8 - 12 / 4 =3

A) + and - B) - and /
C) + and x D) + and /
 
Answer & Explanation Answer: B) - and /

Explanation:

On interchanging - and /, we get the equation as

5 + 3 x 8 / 12 - 4 = 3

or 5 + 3 x (2/3) - 4 = 3

or 3 = 3, which is true.

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117 1775
Q:

Given interchanges : 

Signs + and - , numbers 4 and 8.

A) 4 + 8 - 12 = 12 B) 4 - 8 + 12 = 0
C) 8 + 4 - 12 = 24 D) 8 - 4 + 12 = 8
 
Answer & Explanation Answer: B) 4 - 8 + 12 = 0

Explanation:

 On interchanging + and - and 4 and 8 in (b),

we get the equation as

8 + 4 - 12 = 0 
or 12 - 12 = 0
or 0 = 0, which is true.

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66 1593
Q:

If A + B = 2C and C + D = 2A, then

A) A + C = B + D B) A + C = 2D
C) A + D = B + C D) A + C = 2B
 
Answer & Explanation Answer: A) A + C = B + D

Explanation:

Given,

A + B = 2C ----(i)

C + D = 2A----(ii)

Adding (i) and (ii) we get : A + B + C + D = 2C + 2A   B + D = A + C

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27 1291
Q:

If × stands for 'addition', ÷ stands for 'subtraction', + stands for 'multiplication' and-stands for 'division', then 20 × 8 ÷ 8 - 4 + 2 = ?

A) 80 B) 25
C) 24 D) 5
 
Answer & Explanation Answer: C) 24

Explanation:

By the Given data , We have the expression:

20 + 8 - 8 ÷ 4 × 2 = 20 + 8 - 2 × 2 = 20 + 8 - 4 = 24.

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57 1204
Q:

Given intercharges : 

Signs + and x and numbers 4 and 5.

A) 5 x 4 + 20 = 40 B) 5 x 4 + 20 = 85
C) 5 x 4 + 20 = 104 D) 5 x 4 + 20 = 95
 
Answer & Explanation Answer: C) 5 x 4 + 20 = 104

Explanation:

 On interchanging + and x and 4 and 5 in (c),

we get the equation as 
4 + 5 x 20 = 104 or 104 = 104, which is true.

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78 908