Question : Directions: On interchanging the given two numbers, which of the following equations will be correct? 1 and 6 I. 7 – 5 + 1 × 3 ÷ 6 = 20 II. 1 × 7 + 6 – 4 ÷ 2 = 40
Option 1: Only I
Option 2: Neither I nor II
Option 3: Both I and II
Option 4: Only II
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Correct Answer: Only I
Solution : Given: I. 7 – 5 + 1 × 3 ÷ 6 = 20 II. 1 × 7 + 6 – 4 ÷ 2 = 40
I. 7 – 5 + 1 × 3 ÷ 6 = 20 On interchanging the numbers in the first equation, we get – 7 – 5 + 6 × 3 ÷ 1 = 20 On solving the L.H.S. of the equation – = 7 – 5 + 6 × 3 = 7 – 5 + 18 = 20 II. 1 × 7 + 6 – 4 ÷ 2 = 40 On interchanging the numbers in the second equation, we get – 6 × 7 + 1 – 4 ÷ 2 = 40 On solving the L.H.S. of the equation – = 6 × 7 + 1 – 2 = 42 + 1 – 2 = 41 ≠ 40
So, only the first equation is correct. Hence, the first option is correct.
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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 2: 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 7 I. 7 × 3 – 8 + 4 + 9 = 32 II. 7 – 9 × 2 + 6 ÷ 3 = –3
Option 1: Only II
Option 4: Only I
Question : Directions: By Interchanging the given two numbers which of the following equations will be correct? 7 and 8 I. 5 × 7 + 6 ÷ 2 – 8 = 36 II. 8 + 3 × 7– 5 ÷ 1 = 26
Option 1: Neither I nor II
Option 2: Only 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 3: Neither I nor II
Question : Directions: By Interchanging the given two numbers which of the following equations will be correct? 5 and 4 I. 4 + 8 × 5 – 7 ÷ 1 = 30 II. 5 × 3 – 4 + 6 ÷ 2 = 11
Option 1: Both I and II
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