Brainly Experts
Help me
If 31z5 is a multiple of 9, where z is a digit, what is the value of z? You will find that there are two answers for the last problem. Why is this so?
Answers
Answered by
1
Answer:
Playing with Numbers
∵ 31z5 is divisible by 9. ∴ (9 + z) must be equal to 0, or 9 or 18 or 27, ... But z is a digit. ∴ 9 + z = 0 or 9 + z= 18 If 9 + z = 0, then z = 0 and if 9 + z = 18, then z = 9.
Answered by
1
Answer:
Answer is 0
3 + 1 + 0 + 5 = 9
Divisibility of 9
Similar questions