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Semantic Mathematical Operations classification Questions and Answers with Detailed Explanation for SSC CHSL 2020 and SSC CGL 2020

Directions: Kindly solve the following questions and choose an option as your answer for each.
Important for :
CGLTier 1 SSC 10+2
1
 Which interchange of signs will make the following equation correct?

(8 – 8) + 8 × 32 = 64
» Explain it
D
From the fourth option, we get:

(8 – 8) + 8 × 32 = 64

⇒  (8 + 8) ÷ 8 × 32 = 64

⇒ 16 ÷ 8 × 32 = 64

⇒ 2 × 32 = 64

Hence, the option D is correct.\

2
 Which of the following interchange of sign would make the given equation correct?

64 – 8 × 9 ÷ 8 = 64
» Explain it
D
From the option fourth, we get

64 – 8 × 9 ÷ 8 = 64

Putting (– & ÷) in the equation,

⇒ 64 ÷ 8 × 9 – 8 = 64

⇒ 8 × 9 – 8 = 64

⇒ 72 – 8 = 64

⇒ 64 = 64

Hence, the option D is correct.

3
If + stands for division; × stands for addition;  –  stands for multiplication; ÷ stands for subtraction, which of the following is correct?

1. 15 ÷ 5 × 2 – 6 + 3 = 28

2. 15 × 5 + 2 – 6 ÷ 3 = 56.5

3. 15 + 5 – 2 ÷ 6 × 3 = 3

4. 15 – 5 + 2 × 6 ÷ 3 = 41

A
3
» Explain it
A
From the third equation, we get

15 + 5 – 2 ÷ 6 × 3 = 3

After interchanging the symbol

⇒ 15 ÷ 5 × 2 – 6 + 3 = 3

⇒ 3 × 2 – 6 + 3 = 3

⇒ 6 – 6 + 3 = 3

⇒ 3 = 3

Hence, the option A is correct.