Question : Directions: Which of the following interchange of signs would make the given equation correct? 28 – 7 + 2 × 2 = 0
Option 1: Change + into ×
Option 2: Change × into +
Option 3: Change – into +
Option 4: Change + into –
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Correct Answer: Change + into ×
Solution : Given: 28 – 7 + 2 × 2 = 0
Replace the given symbols in the options one by one with the original symbols in the given equation. First option: Change + into × = 28 – 7 × 2 × 2 = 28 – 28 = 0 Second option: Change × into + = 28 – 7 + 2 + 2 = 28 – 7 + 4 = 28 – 3 25 ≠ 0 Third option: Change – into + = 28 + 7 + 2 × 2 = 28 + 7 + 4 = 28 + 11 39 ≠ 0 Fourth option: Change + into – = 28 – 7 – 2 × 2 = 28 – 7 – 4 = 28 – 11 17 ≠ 0
Here, only the first option satisfies the R.H.S. of the given equation. Hence, the first option is correct.
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