If the number 58579A is exactly divisible by 36, then what is the value of A?

2021

If the number 58579A is exactly divisible by 36, then what is the value of A?

  1. A.

    2

  2. B.

    4

  3. C.

    6

  4. D.

    8

Attempted by 53 students.

Show answer & explanation

Correct answer: A

To be divisible by 36, the number must be divisible by both 4 and 9 (since 4 × 9 = 36).

For divisibility by 4, the last two digits (9A) must be divisible by 4. Checking values, 92 and 96 are divisible by 4. So, A could be 2 or 6.

For divisibility by 9, the sum of digits (5 + 8 + 5 + 7 + 9 + A) = 34 + A must be divisible by 9.

If A = 2, sum = 36 (divisible by 9). However, we must check if 58792 is divisible by 36. 58792 ÷ 4 = 14698, but 14698 is not divisible by 9.

Let's re-check the calculation: If A = 4, 94 is not divisible by 4. Wait, the condition for 4 is the last two digits. Let's re-verify:

Divisibility by 4: 9A must be divisible by 4. Possible values: 92 (A=2) or 96 (A=6).

Sum of digits: 5+8+5+7+9+A = 34+A. For 34+A to be divisible by 9, A must be 2 (34+2=36).

Let's re-examine the number 5879A. If A=2, number is 58792. 58792/4 = 14698. 14698/9 = 1633.11 (Not divisible).

Let's check if the number was 58579A. Sum: 5+8+5+7+9+A = 34+A. For A=2, sum=36. 585792 / 36 = 16272. It is correct.
Final Answer: Option 1 (2)

Explore the full course: Rssb Senior Computer Instructor