Select the correct answerIf a number 774958A96B is divisible by 8 and 9, the respectively values of A and B will beOptions7 and 85 and 88 and 0None
Question
Select the correct answer
If a number 774958A96B
is divisible by 8 and 9, the respectively values of A and B will be
Options:
- 7 and 8
- 5 and 8
- 8 and 0
- None
Solution
To find the values of A and B, we need to understand the divisibility rules of 8 and 9.
- A number is divisible by 8 if the last three digits of the number form a number that is divisible by 8.
- A number is divisible by 9 if the sum of its digits is divisible by 9.
Let's apply these rules to the number 774958A96B.
-
For the number to be divisible by 8, the last three digits (6B) must form a number divisible by 8. The only way this can happen is if B = 0, because 960 is divisible by 8.
-
For the number to be divisible by 9, the sum of its digits (including A and B) must be divisible by 9. If we add up the known digits, we get 7+7+4+9+5+8+A+9+6+0 = 55 + A. For this sum to be divisible by 9, A must be 1, because 55 + 1 = 56, which is not divisible by 9. Therefore, A must be 8, because 55 + 8 = 63, which is divisible by 9.
So, the values of A and B that make the number 774958A96B divisible by both 8 and 9 are A = 8 and B = 0. Therefore, the correct answer is "8 and 0".
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