Question

If 4821X14Y is an eight digit number divisible by 72. How many rules can X and Y take

Answer 1

Answer:

Step-by-step explanation:

According to the divisibility rule, your question should be divisible by 9 and 8

divisibility rule of 9 is the sum of all digit should be divisible by 9

and divisibility rule of 8 is the last digit 3 should be divisible by 8

the sum of all digit is 4+8+2+1+X+1+4+Y = 20+X+Y

the last digit will be divisible by 8= 14Y/8

IF we put 3 in the place of y . the number will be exactly divisible by 8

And the value of x should be

20+X+Y

the value of y is 3 so the value of x would be 5

so that the sum of all digit divisible by 9

and the last 3 digits divisible by 8