Question

If a number 573 xy is divisible by 90, then what is the value of x+y?

Answer 1

If 573xy is divisible by 90, it should be divisible by 9 and 10 both. Since it is divisible by 10, last digit, i.e. y is 0. Since the number is divisible by 9, sum of its all digits must be 9 or its multiple. Sum of digits of 573 is 15. Therefore, value of x is 3. Thus value of x+y is 3+0=3.

Answer 2

Answer:

573xy is divisible by 90.divisibility rule of 9 is sum of the numbers is divisible by 9 so 5+7+3=15added number is 3 *15+3=18