Question

Which interchange of signs will make the following equation correct? 10 + 10 ÷ 10 - 10 × 10 = 10

• A. + and ÷
• B. + and ×
• C. ÷ and -
• D. × and -
• E. ÷ and +

Hint:

Test each options by substituting the swapped signs and evaluating using BODMAS rule.

Answer 1

The Correct Option is C

Step 1: Test each options: options A: swap + and ÷: $10 ÷ 10 + 10 - 10 × 10 = 1 + 10 - 100 = -89$, not 10. options B: swap + and ×: $10 × 10 ÷ 10 - 10 + 10 = 100 ÷ 10 - 10 + 10 = 10 - 10 + 10 = 10$. Works!
Step 2: Check: $10 × 10 ÷ 10 - 10 + 10 = 10 - 10 + 10 = 10$.
Step 3: Final Answer: + and ×.