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Q: What will come in the place of the question mark (?) in the following equation, if ‘÷’ and ‘−’ are interchanged and ‘×’ and ‘+’ are interchanged? 15 × 11 ÷ 49 − 7 + 3 = ?
  • A. –15
  • B. 15
  • C. 5
  • D. –5
Correct Answer: Option C - Given, 15 × 11 ÷ 49 – 7 + 3 = ? On interchanging the given signs according to the question, 15 + 11 – 49 ÷ 7 × 3 = ? 15 + 11 – 7 × 3 = ? 15 + 11 – 21 = ? 26 – 21 = ? 5 = ? ∴ ? = 5
C. Given, 15 × 11 ÷ 49 – 7 + 3 = ? On interchanging the given signs according to the question, 15 + 11 – 49 ÷ 7 × 3 = ? 15 + 11 – 7 × 3 = ? 15 + 11 – 21 = ? 26 – 21 = ? 5 = ? ∴ ? = 5

Explanations:

Given, 15 × 11 ÷ 49 – 7 + 3 = ? On interchanging the given signs according to the question, 15 + 11 – 49 ÷ 7 × 3 = ? 15 + 11 – 7 × 3 = ? 15 + 11 – 21 = ? 26 – 21 = ? 5 = ? ∴ ? = 5