If a nine-digit number 785x3678y is divided by 72, then the value of ( x - y) is :
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 2
9 digit number 785x3678y is divided by 72.
The number divisible by 72 is also divisible by 8 and 9 both.
A number will be divisible by 8 if the last 3 digit of a number is divisible by 8.
78y will be divisible by 8 if y = 4
A number will be divisible by 9 if the sum of the digits is divisible by 9.
985x36784 will be divisible by 9 if x = 6
x - y = 6 - 4 = 2