Question : Directions: The following equation is incorrect. Which two signs should be interchanged to correct the equation? 15 × 18 – 6 ÷ 20 + 4 = 29
Option 1: + and ×
Option 2: ÷ and –
Option 3: + and ÷
Option 4: – and +
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Correct Answer: ÷ and –
Solution : Given: 15 × 18 – 6 ÷ 20 + 4 = 29
Replace the signs given in the options one by one with those in the given equation. First option: + and × = 15 + 18 – 6 ÷ 20 × 4 = 15 + 18 – 0.3 × 4 = 15 + 18 – 1.2 = 31.8 ≠ 29 Second option: ÷ and – = 15 × 18 ÷ 6 – 20 + 4 = 15 × 3 – 20 + 4 = 45 – 20 + 4 = 29 Third option: + and ÷ = 15 × 18 – 6 + 20 ÷ 4 = 15 × 18 – 6 + 5 = 270 – 6 + 5 = 269 ≠ 29 Fourth option: – and + = 15 × 18 + 6 ÷ 20 – 4 = 15 × 18 + 0.3 – 4 = 270 + 0.3 – 4 = 270.3 – 4 = 266.3 ≠ 29
Only the second option satisfies the R.H.S. of the given equation. Hence, the second option is correct.
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Question : Direction: The following equation is incorrect. Which two signs should be interchanged to correct the equation?
12 + 10 – 28 ÷ 7 × 4 = 48
Option 1: ÷ and –
Option 2: + and ÷
Option 3: – and +
Option 4: × and –
Question :
Directions: In the following question you have to identify the correct response from the given premises stated according to the following symbols: If the given interchanges are made in signs and numbers, which one of the following equations is true? (Signs: ÷ and +, Numbers: 6 and 5)
Option 1: 18 + 6 ÷ 5 = 9.6
Option 2: 26 ÷ 5 + 6 = 6.4
Option 3: 5 ÷ 6 + 80 = 5.8
Option 4: 90 + 5 ÷ 6 = 8.6
Question : Ramesh marks his article at Rs. 6,000, and after allowing a discount of 20%, he still earns a 60% profit. What is the cost (in Rs.) of the article?
Option 1: 3,600
Option 2: 4,800
Option 3: 3,000
Option 4: 4,200
Question : Directions: What will come in the place of the question mark (?) in the following equation if + and – are interchanged and × and ÷ are interchanged? 6 + 15 × 5 – 4 ÷ 3 = ?
Option 1: 12
Option 2: 21
Option 3: 18
Option 4: 15
Question : The value of Avogadro number is
Option 1: 6.023 X 1022
Option 2: 6.023 X 1023
Option 3: 6.023 X 1024
Option 4: 6.023 X 1025
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