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Q: What will come in place of the question mark (?) in the following equation, if '+' and '–' are interchanged and '×' and '+' are interchanged? 31 + 14 – 28 × 7 ÷ 13 = ?
  • A. 69
  • B. 72
  • C. 67
  • D. 75
Correct Answer: Option A - Given, 31 + 14 – 28 × 7 ÷ 13 = ? On interchanging the signs according to question, ? = 31 – 14 + 28 ÷ 7 × 13 = 31 – 14 + 4 × 13 = 31 – 14 + 52 = 83 – 14 ∴ ? = 69
A. Given, 31 + 14 – 28 × 7 ÷ 13 = ? On interchanging the signs according to question, ? = 31 – 14 + 28 ÷ 7 × 13 = 31 – 14 + 4 × 13 = 31 – 14 + 52 = 83 – 14 ∴ ? = 69

Explanations:

Given, 31 + 14 – 28 × 7 ÷ 13 = ? On interchanging the signs according to question, ? = 31 – 14 + 28 ÷ 7 × 13 = 31 – 14 + 4 × 13 = 31 – 14 + 52 = 83 – 14 ∴ ? = 69