UPSC Prelims 2023·CSAT·Quantitative Aptitude·Number System

Let x be a positive integer such that 7x + 96 is divisible by x . How many values of x are possible?

Dalvoy logo
Reviewed by Dalvoy
UPSC Civil Services preparation
Last updated 23 May 2026, 3:31 pm IST
  1. A10
  2. B11
  3. C12Correct
  4. DInfinitely many

Explanation

To solve this, we analyze the expression (7x + 96) / x. This can be separated into two parts: (7x / x) + (96 / x). Simplifying the first part gives 7 + (96 / x). For the entire expression to result in an integer, 96 must be divisible by x. This means x must be a factor of 96. To find the number of factors of 96, we first find its prime factorization: 96 = 2 raised to the power of 5 multiplied by 3 raised to the power of 1. The total number of factors is calculated by adding 1 to each exponent and multiplying them together: (5 + 1) * (1 + 1) = 6 * 2 = 12. Since there are 12 factors of 96, there are 12 possible values for x. Therefore, the correct answer is C.
Quantitative Aptitude: Let x be a positive integer such that 7x + 96 is divisible by x . How many values of x are possible?

Related questions

More UPSC Prelims practice from the same subject and topic.