Question : Directions: By interchanging the given two signs and numbers which of the following equations will be not correct? + and ×, 5 and 4 I. 4 + 8 × 5 – 7 ÷ 1 = 37 II. 5 × 3 – 4 + 6 ÷ 2 = – 8
Option 1: Only II
Option 2: Neither I nor II
Option 3: Only I
Option 4: Both I and II
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Correct Answer: Neither I nor II
Solution : Given: + and ×, 5 and 4 I. 4 + 8 × 5 – 7 ÷ 1 = 37 II. 5 × 3 – 4 + 6 ÷ 2 = – 8
Interchange the numbers and signs in the equations one by one in the given equation. Equation I: 4 + 8 × 5 – 7 ÷ 1 = 37 ⇒ 5 x 8 + 4 – 7 ÷ 1 = 37 ⇒ 5 x 8 + 4 - 7 ⇒ 40 + 4 - 7 ⇒ 37 = R.H.S. Equation II: 5 × 3 – 4 + 6 ÷ 2 = – 8 ⇒ 4 + 3 – 5 x 6 ÷ 2 = –8 ⇒ 4 + 3 – 5 x 3 ⇒ 4 + 3 – 15 ⇒ 7 – 15 ⇒ – 8 = R.H.S.
So, both the equations satisfy the R.H.S. Hence, the second option is correct.
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Question : Directions: By interchanging the given two signs and numbers which of the following equations will be not correct? – and ÷, 8 and 2 I. 5 + 7 – 8 × 4 ÷ 2 = 9 II. 3 + 8 × 4 –2 ÷ 1 = 3
Option 1: Neither I nor II
Option 2: Only II
Option 3: Both I and II
Option 4: Only I
Question : Directions: By interchanging the given two signs and numbers which of the following equations will be not correct? × and –, 8 and 4 I. 4 + 3 × 8 – 2 ÷ 1 = 3 II. 8 × 2 – 4 + 6 ÷ 2 = 11
Option 1: Both I and II
Option 3: Neither I nor II
Question : Directions: By interchanging the given two signs and numbers which of the following equations will be not correct? × and ÷, 2 and 6 I. 7 – 4 × 3 ÷ 6 + 2 = 8 II. 6 – 8 × 2 + 9 ÷ 3 = 5
Question : Directions: By interchanging the given two signs and numbers which of the following equations will be not correct? × and +, 7 and 4 I. 7 × 8 + 4 – 6 ÷ 3 = 57 II. 4 × 8 – 9 ÷ 3 + 7 = 3
Option 2: Only I
Question : Directions: After interchanging the given two numbers and two signs what will be the values of equations (I) and (II) respectively? + and ×, 5 and 4 I. 4 + 6 × 5 – 7 ÷ 1 II. 5 × 3 – 4 + 8 ÷ 2
Option 1: –9, –8
Option 2: 30, –13
Option 3: 20, 6
Option 4: 27, –13
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