Question : Directions: By interchanging which two signs the given equation will be correct? 39 – 3 ÷ 13 + 16 × 8 = 17
Option 1: × and –
Option 2: + and –
Option 3: ÷ and –
Option 4: × and ÷
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Correct Answer: × and –
Solution : Given: 39 – 3 ÷ 13 + 16 × 8 = 17
Let's check the options – First option: × and – 39 – 3 ÷ 13 + 16 × 8 = 17 On interchanging the mathematical signs, we get – ⇒ 39 × 3 ÷ 13 + 16 – 8 = 17 ⇒ 9 + 16 – 8 ⇒ 25 – 8 ⇒ 17 Second option: + and – 39 – 3 ÷ 13 + 16 × 8 = 17 On interchanging the mathematical signs, we get – ⇒ 39 + 3 ÷ 13 – 16 × 8 = 17 ⇒ 39 + 0.23 – 16 × 8 ⇒ 39 + 0.23 – 128 ⇒ – 88.77 ≠ 17 Third option: ÷ and – 39 – 3 ÷ 13 + 16 × 8 = 17 On interchanging the mathematical signs, we get – ⇒ 39 ÷ 3 – 13 + 16 × 8 = 17 ⇒ 13 – 13 + 16 × 8 ⇒ 13 – 13 + 128 ⇒ 128 ≠ 17 Fourth option: × and ÷ 39 – 3 ÷ 13 + 16 × 8 = 17 On interchanging the mathematical signs, we get – ⇒ 39 – 3 × 13 + 16 ÷ 8 = 17 ⇒ 39 – 3 × 13 + 2 ⇒ 39 – 39 + 2 ⇒ 2 ≠ 17
Here, only the first option satisfies the R.H.S. of the equation. Hence, the first option is correct.
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Question : Directions: By interchanging which two signs the given equation will be correct? 12 ÷ 16 – 8 + 14 × 2 = 38
Option 1: – and ÷
Option 2: × and ÷
Option 3: ÷ and +
Option 4: + and ×
Question : Directions: By interchanging which two numbers (not digits) the given equation will be correct? 13 + 9 ÷ 78 × 27 – 16 = 3
Option 1: 3 and 78
Option 2: 78 and 27
Option 3: 13 and 78
Option 4: 27 and 16
Question : Directions: Which two signs and two numbers interchange (not digits) that will make the equation correct? 7 – 5 × 2 + 8 ÷ 4 = 17
Option 1: – and ÷, 8 and 5
Option 2: × and ÷, 5 and 4
Option 3: + and –, 4 and 5
Option 4: + and –, 7 and 5
Question : Directions: By interchanging the given two signs which of the following equations will be correct? + and × l. 5 × 12 – 15 + 20 ÷ 30 = 7 II. 51 ÷ 17 × 9 + 10 – 8 = 85
Option 1: Both I and II
Option 2: Neither I nor II
Option 3: Only I
Option 4: Only II
Question : Directions: After interchanging the given two numbers (Not digits) what will be the values of expression (I) and (II) respectively? 4 and 6 l. 8 – 4 × 3 + 6 ÷ 2 II. 4 + 3 × 6 – 8 ÷ 2
Option 1: 8 and 10
Option 2: 10 and 8
Option 3: 14 and – 8
Option 4: – 8 and 14
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