Question

What will come in the place of the question mark (?) in the following equation, if '+' and '-' are interchanged and 'x' and '÷' are interchanged? 5 ÷ 4 - 3 x 1 + 2 = ?

• A. 21
• B. 16
• C. 19
• D. 20

Answer 1

Answer:

A. 21

Interchange the operators:

• (+) ↔ (−)

• (×) ↔ (÷)

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Given:

$5 ÷ 4 - 3 × 1 + 2$

After interchange:
$5 × 4 + 3 ÷ 1 - 2$

Do × and ÷

$5 × 4 = 20$

$3 ÷ 1 = 3$

So:
$20 + 3 - 2$

Simplify

$20 + 3 = 23$

$23 - 2 = 21$

Final Answer: 21