Question

if 2536z4 is a multiple of 9,where z is a digit ,what is the value of z​

Answer 1

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.