On subtracting 13 from 3 times of a number, the result is.......

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Bihar STET Paper I: Mathematics (Held In 2019 - Shift 1)
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  1. 6
  2. 7
  3. 8
  4. 9

Answer (Detailed Solution Below)

Option 3 : 8
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Bihar STET Paper 1 Mathematics Full Test 1
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Detailed Solution

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According to Question 

3x - 13 = (6, 7, 8 or 9) any of these

Let the number be 8

3 × 8 - 13 = 11 

Hence, The Number should be less than 8 

Let the number be 6

3 × 6 - 13 = 5

Hence, The Number should be greater than 6 so, that the resultant should be from the options

Now, Take x = 7 

 3 × 7 - 13 = 21 - 13 = 8

Hence, The Result is 8 

Additional Information 

It only seems that the information is incomplete, but if you check the solution, you will understand the logic. This is BPSC/BSEB previous year question and is correct.

Here, the value will have to be greater than 6, since using 6, we do not get any of the 4 options.
Also, if we take 8, the answer is more than all the given options,

Now when we take x = 7, the answer matches and hence 3 × 7 - 13 = 21 - 13 = 8 is the correct option

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