Question : Directions: Which two signs should be interchanged to make the given equation correct? 108 ÷ 2 × 10 + 70 – 10 = 480
Option 1: + and –
Option 2: ÷ and ×
Option 3: + and ×
Option 4: ÷ and –
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Correct Answer: + and –
Solution : Given: 108 ÷ 2 × 10 + 70 – 10 = 480
Replace the given symbols in the options one by one with the original symbols in the given equation. First option: + and – = 108 ÷ 2 × 10 – 70 + 10 = 540 – 70 + 10 = 480 Second option: ÷ and × = 108 × 2 ÷ 10 + 70 – 10 = 21.6 + 60 = 81.6 ≠ 480 Third option: + and × = 108 ÷ 2 + 10 × 70 – 10 = 54 + 700 – 10 = 744 ≠ 480 Fourth option: ÷ and – = 108 – 2 × 10 + 70 ÷ 10 = 108 – 20 + 7 = 95 ≠ 480
Here, only the first option satisfies the R.H.S. of the given equation. Hence, the first option is correct.
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Option 1: + and ×
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Option 4: – and ×
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Option 1: ÷ and +
Option 2: × and ÷
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Option 1: + and ÷
Option 2: + and ×
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Option 1: × and –
Option 2: ÷ and –
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