Question : Directions: By interchanging the given two signs which of the following equations will be not correct? + and ÷
Option 1: 12 ÷ 8 × 12 + 6 – 7 = 21
Option 2: 9 – 3 + 12 × 8 ÷ 4 = 11
Option 3: 46 + 23 ÷ 14 × 5 – 6 = 66
Option 4: 6 + 20 ÷ 12 × 7 – 11 = 70
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Correct Answer: 6 + 20 ÷ 12 × 7 – 11 = 70
Solution : Given: Interchange the signs + and ÷
Replace the given signs in the options one by one with the original signs in the given equation. First option: 12 ÷ 8 × 12 + 6 – 7 = 21 ⇒ 12 + 8 × 12 ÷ 6 – 7 = 12 + 16 – 7 = 21 Second option: 9 – 3 + 12 × 8 ÷ 4 = 11 ⇒ 9 – 3 ÷ 12 × 8 + 4 = 9 – 2 + 4 = 11 Third option: 46 + 23 ÷ 14 × 5 – 6 = 66 ⇒ 46 ÷ 23 + 14 × 5 – 6 = 2 + 70 – 6 = 66 Fourth option: 6 + 20 ÷ 12 × 7 – 11 = 70 ⇒ 6 ÷ 20 + 12 × 7 – 11 = 0.3 + 84 – 11 = 73.3 ≠ 70
So, only the fourth option satisfies the L.H.S. ≠ R.H.S. of the given equation. Hence, the fourth option is correct.
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Question : Directions: By interchanging the given two signs which of the following equations will be correct? ÷ and +
Option 1: 18 ÷ 24 – 6 × 6 + 3 = 32
Option 2: 12 – 8 + 12 × 9 ÷ 3 = 10
Option 3: 12 ÷ 8 × 3 + 6 – 10 = 8
Option 4: 7 + 21 × 42 ÷ 14 – 9 = 19
Question : Directions: By interchanging the given two signs and numbers which of the following equations will be correct? × and ÷, 7 and 9
Option 1: 9 – 7 × 2 + 6 ÷ 3 = 11
Option 2: 9 + 4 × 3 – 7 ÷ 1 = 40
Option 3: 8 × 3 ÷ 6 + 9 – 7 = 14
Option 4: 9 × 3 + 4 ÷ 2 – 7 = 18
Question : Directions: By interchanging the given two signs and numbers which of the following equations will be correct? × and +, 9 and 6
Option 1: 7 × 6 ÷ 3 + 9 – 8 = 17
Option 2: 6 × 8 – 9 ÷ 3 + 5 = 50
Option 3: 7 + 6 × 4 ÷ 9 – 8 = 8
Option 4: 9 × 7 + 4 ÷ 1 – 6 = 7
Question : Directions: By interchanging the given two signs and numbers which of the following equations will be correct? – and +, 6 and 3
Option 1: 7 – 3 × 2 ÷ 6 + 4 = 17
Option 2: 8 × 3 – 6 + 4 ÷ 2 = 49
Option 3: 7 + 6 ÷ 3 × 8 – 5 = 35
Option 4: 9 – 6 ÷ 4 + 3 × 7 = 8
Question : Directions: By interchanging the given two signs which of the following equations will be correct? × and –
Option 1: 7 × 9 – 8 ÷ 2 + 6 = 25
Option 2: 8 × 6 – 9 ÷ 3 + 10 = 0
Option 3: 16 – 4 ÷ 2 + 8 × 1 = 36
Option 4: 5 + 7 × 3 – 4 ÷ 2 = 8
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