Question
After interchanging ÷ and × , 4 and 8, which of the
following equations becomes correct?Solution
1. 35 ÷ 8 + 16 × 4 – 2  = 142 ⇒ 35 × 4 + 16 ÷ 8 – 2  ⇒ 140 + 2 – 2   ⇒ 140 ≠142 2. 40 ×  4 + 13 ÷ 8 - 7  = 50 ⇒ 40 ÷ 8 + 13 × 4 – 7   ⇒ 5 + 52 – 7 ⇒ 50 = 50 3. 84 ×  8  + 12 ÷ 4 – 3  = 110 ⇒ 84 ÷ 4 + 12 × 8 – 3   ⇒ 21 + 96 – 3   ⇒ 114 ≠110 4. 50 ÷ 8 – 16 × 8 + 2 = 208 ⇒ 50 × 4 – 16 ÷ 4 + 2 ⇒ 200 – 4 + 2   ⇒ 198 ≠110 Hence, option 2 is correct.
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