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    Question

    After interchanging '- ' and '+ ' , 6 and 7 , which

    of the following equations becomes correct?
    A 40 + 6 × 13 – 7 × 2 = 104 Correct Answer Incorrect Answer
    B 35 – 7 × 3 + 6 = 45 Correct Answer Incorrect Answer
    C 6 × 14 + 36 ÷ 7 – 2 = 92 Correct Answer Incorrect Answer
    D 38 – 6 × 13 + 66 ÷ 7 = 118 Correct Answer Incorrect Answer

    Solution

    1. 40 + 6 × 13 – 7 × 2  = 104 ⇒ 40 – 7 × 13 + 6 × 2 ⇒ 40 – 91 + 12 ⇒ - 39  ≠ 104 2. 35 – 7  ×  3 + 6 = 45 ⇒ 35 + 6 × 3 – 7  ⇒ 35 + 18 – 7  ⇒ 46 ≠ 45 3. 6 ×  14  + 36 ÷ 7 – 2  = 92 ⇒ 7 × 14 – 36 ÷ 6 + 2  ⇒ 98 – 6 + 2  ⇒ 94 ≠ 92 4. 38 – 6 × 13 + 66  ÷ 7 = 118 ⇒ 38 + 7 × 13 – 66 ÷ 6   ⇒ 38 + 91 – 11   ⇒ 118 = 118 Hence, option 4 is correct.

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