Question : Directions: By interchanging the two signs which of the following equations will not be correct? + and × I.15 + 5 ÷ 1 – 9 × 4 = 70 II.18 × 17 + 3 – 6 ÷ 2 = 133
Option 1: Neither I nor II
Option 2: Only II
Option 3: Both I and II
Option 4: Only I
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Correct Answer: Only II
Solution : Given: + and × are interchanged. I.15 + 5 ÷ 1 – 9 × 4 = 70 II.18 × 17 + 3 – 6 ÷ 2 = 133
After interchanging the symbols the equation becomes – I.15 × 5 ÷ 1 – 9 + 4 = 70 = 75 – 5 = 70 = R.H.S. II.18 + 17 × 3 – 6 ÷ 2 = 133 = 18 + 17 × 3 – 3 = 18 + 51 – 3 = 66 ≠ 133
So, the equation II is not correct. Hence, the second option is correct.
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Question : Directions: By interchanging the given two signs which of the following equations will be correct? + and ÷ I. 4 ÷ 2 + 1 – 8 × 3 = –10 II. 18 ÷ 2 – 8 + 4 × 3 = 14
Option 1: Only II
Option 2: Only I
Option 3: Neither I nor II
Option 4: Both I and II
Question : Directions: By interchanging the given two signs ÷ and –, which of the following equations will be correct? I. 143 + 6 × 18 ÷ 45 – 3 = 236 II. 133 – 7 + 16 × 11 ÷ 37 = 158
Option 1: Both I and II
Option 3: Only II
Option 4: Neither I nor II
Question : Directions: By Interchanging the given two numbers which of the following equations will be not correct? 9 and 3 I. 7 × 4 ÷ 2 – 9 + 3 = 22 II. 9 + 4 – 6 × 3 ÷ 2 = –10
Option 1: Only I
Option 2: Both I and II
Question : Directions: By interchanging the given two signs which of the following equations will be not correct? + and – I. 4 × 6 + 7 – 3 ÷ 1 = 21 II. 6 × 9 + 7 – 8 ÷ 2 = 51
Option 4: Only II
Question : Directions: By interchanging the given two signs which of the following equations will be not correct? + and ÷ I. 9 ÷ 6 × 4 + 2 – 5 = 16 II. 5 – 28 + 7 × 16 ÷ 4 = –103
Option 2: Neither I nor II
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