Question

if 23z13 is divisible by 9. Find the value of z.​

Answer 1

Answer:

Step-by-step explanation:

the divisibility rule of 9 the sum of the digits of the given number must be divisible by 9

so 2+3+z+1+3 =multiple of 9  

• 9+z=multiple of 9

• z=[multiple of 9]-9

Here, possible values for multiples of 9 is  18

• so z=9

Answer 2

Step-by-step explanation:

2z3 is divisible by 9

find = the value of z

• as per the divisibility rule of 9 the sum of digits of the given number must be divisible by 9

• we have given the number 2z3

• sum of the digit is given by

2+z+3

5+z

so 5+z must be the multiple of 9

as z is a digit of the number so it can be a single digit number only

so the sum must be 9

5+z= 9

z=4