If 15z3 is divisible by 9 , where z is a digit then find the value of Z why there are two answer for this problem explain ?
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If 15z3 is divisible by 9 , where z is a digit then find the value of Z why there are two answer for this problem explain ?
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Answer:
z can be 0, as well as 9
Step-by-step explanation:
divisibility rule of 9 :
if the sum of digits is divisible by 9, then the number is also divisible by 9 .
In this question ,
sum is 1+5+3+z = 9+z
so if we want this to be divisible by 9 , we can add 0
therefore z = 0
also , next no. after 9, which id divisible by 9 is 18
so to make the sum 18 , we put z = 9
therefore z = 9
that's why it has 2 answers
hope this helps