Question : Directions: By interchanging the given two signs which of the following equations will be not correct? + and –
Option 1: 8 ÷ 4 × 6 + 5 – 9 = 16
Option 2: 15 + 3 × 4 – 6 ÷ 2 = 6
Option 3: 3 × 2 – 72 ÷ 6 + 8 = 18
Option 4: 3 + 4 – 2 × 5 ÷ 1 = 9
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Correct Answer: 3 × 2 – 72 ÷ 6 + 8 = 18
Solution : Let's check the options – First option: 8 ÷ 4 × 6 + 5 – 9 = 16 On interchanging the given signs, the equation becomes – ⇒ 8 ÷ 4 × 6 – 5 + 9 = 16 Solving the L.H.S. of the equation – = 2 × 6 – 5 + 9 = 12 – 5 + 9 = 21 – 5 = 16 Second option: 15 + 3 × 4 – 6 ÷ 2 = 6 On interchanging the given signs, the equation becomes – ⇒ 15 – 3 × 4 + 6 ÷ 2 = 6 Solving the L.H.S. of the equation – = 15 – 3 × 4 + 3 = 15 – 12 + 3 = 18 – 12 = 6 Third option: 3 × 2 – 72 ÷ 6 + 8 = 18 On interchanging the given signs, the equation becomes – ⇒ 3 × 2 + 72 ÷ 6 – 8 = 18 Solving the L.H.S. of the equation – = 3 × 2 + 12 – 8 = 6 + 12 – 8 = 18 – 8 = 10 ≠ 18 Fourth option: 3 + 4 – 2 × 5 ÷ 1 = 9 On interchanging the given signs, the equation becomes – ⇒ 3 – 4 + 2 × 5 ÷ 1 = 9 Solving the L.H.S. of the equation – = 3 – 4 + 2 × 5 = 3 – 4 + 10 = 13 – 4 = 9
So, only the equation in the third option does not satisfy the R.H.S. of the given equation. Hence the third option is correct.
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Question : Directions: By interchanging the given two signs which of the following equations will be not correct? × and –
Option 1: 15 + 5 ÷ 1 – 9 × 4 = 70
Option 2: 5 – 6 × 3 + 16 ÷ 4 = 31
Option 3: 11 + 6 × 3 – 8 ÷ 2 = 5
Option 4: 15 – 4 × 3 + 6 ÷ 1 = 63
Question : Directions: By interchanging the given two signs and numbers which of the following equations will be correct? × and +, 6 and 4
Option 1: 3 × 9 – 4 ÷ 2 + 6 = 8
Option 2: 8 × 6 + 4 ÷ 2 – 5 = –5
Option 3: 8 – 3 × 6 + 4 ÷ 1 = 18
Option 4: 7 × 6 – 4 + 9 ÷ 3 = –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: 8 – 3 × 4 ÷ 6 + 9 = 18
Option 2: 8 + 4 × 6 ÷ 3 – 9 = 15
Option 3: 9 ÷ 3 × 4 – 6 + 7 = 10
Option 4: 6 ÷ 2 × 8 + 3 – 1 = 20
Question : Directions: By interchanging the given two signs which of the following equations will be correct? × and +
Option 1: 7 × 8 ÷ 9 + 18 – 11 = 16
Option 2: 24 – 8 – 5 × 5 + 3 = 14
Option 3: 5 × 10 – 15 + 20 ÷ 25 = 8
Option 4: 24 × 8 + 6 ÷ 3 – 18 = 22
Question : Directions: By interchanging the given two signs and numbers which of the following equations will not be correct? ÷ and ×, 1 and 3
Option 1: 6 ÷ 3 – 1 + 4 × 2 = 5
Option 2: 4 × 3 – 1 + 8 ÷ 2 = 9
Option 3: 5 – 8 × 3 + 9 ÷ 1 = 24
Option 4: 6 + 4 – 9 × 3 ÷ 1 = –17
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