Question : Directions: Which two signs should be interchanged to make the given equation correct? 63 = 56 + 88 ÷ 11 – 15
Option 1: – and =
Option 2: + and ÷
Option 3: ÷ and –
Option 4: + and =
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Correct Answer: – and =
Solution : Given: 63 = 56 + 88 ÷ 11 – 15
Let's check the options – First option: – and = On interchanging the mathematical signs, we get – ⇒ 63 – 56 + 88 ÷ 11 = 15 L.H.S. = 63 – 56 + 88 ÷ 11 = 63 – 56 + 8 = 15 L.H.S. = R.H.S. Second option: + and ÷ On interchanging the mathematical signs, we get – ⇒ 63 = 56 ÷ 88 + 11 – 15 L.H.S. = 63 R.H.S. = 56 ÷ 88 + 11 – 15 = 0.64 + 11 – 15 L.H.S. ≠ R.H.S. Third option: ÷ and – On interchanging the mathematical signs, we get – ⇒ 63 = 56 + 88 – 11 ÷ 15 L.H.S. = 63 R.H.S. = 56 + 88 – 11 ÷ 15 = 56 + 88 – 0.73 = 144 – 0.73 = 143.267 L.H.S. ≠ R.H.S. Fourth option: + and = On interchanging the mathematical signs, we get – L.H.S. = 63 + 56 = 119 R.H.S. = 88 ÷ 11 – 15 = 8 – 15 = –7 L.H.S. ≠ R.H.S.
Hence, the first option is correct.
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