Question : Directions: By Interchanging the given two numbers which of the following equations will be correct? 7 and 4 I. 7 × 8 + 4 – 9 ÷ 3 = 30 II. 9 + 4 × 8 ÷ 2 – 7 = 33
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: 7 and 4 are interchanged. I. 7 × 8 + 4 – 9 ÷ 3 = 30 II. 9 + 4 × 8 ÷ 2 – 7 = 33
After interchanging the numbers as per the instructions the equation becomes – Equation I: 4 × 8 + 7 – 9 ÷ 3 = 30 = 4 × 8 + 7 – 3 = 32 + 7 – 3 = 36 ≠ 30 Equation II: 9 + 7 × 8 ÷ 2 – 4 = 33 = 9 + 7 × 4 – 4 = 9 + 28 – 4 = 33 = R.H.S.
So, only the second equation satisfies the R.H.S. of the equation. Hence, the second 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 7 I. 7 × 3 – 8 + 4 + 9 = 32 II. 7 – 9 × 2 + 6 ÷ 3 = –3
Option 1: Only II
Option 2: 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
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 correct? 7 and 8 I. 5 × 7 + 6 ÷ 2 – 8 = 36 II. 8 + 3 × 7– 5 ÷ 1 = 26
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
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
Option 4: Only II
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