Question

What will come in the place of the question mark (?) in the following equation if ‘+’ and ‘÷’ are interchanged? 20 + 5 ÷ 5 – 10 = ?

• A. 10
• B. – 1
• C. 11
• D. – 5

Answer 1

Answer:

B. – 1

If '+' and '÷' are interchanged, the value in place of the question mark will be -1.

1. Rewrite the equation by swapping the '+' and '÷' signs:
   $20 \div 5 + 5 - 10 = ?$

2. Apply the BODMAS / PEMDAS rule (Division first, then Addition, and finally Subtraction):

   • Division: $20 \div 5 = 4$
     (The equation becomes: $4 + 5 - 10 = ?$)

   • Addition: $4 + 5 = 9$
     (The equation becomes: $9 - 10 = ?$)

   • Subtraction: $9 - 10 = -1$

Wait, let's recalculate carefully to be absolutely certain:

• $20 \div 5 = 4$

• $4 + 5 = 9$

• $9 - 10 = -1$

The final answer is -1.