Question

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

Answer 1

90 is divisible by 9
then,573xy should divisible by 9
divisiblty rule of 9 =sum of the digits is divisible
by 9
so,5+7+3+x+y=15+x+y+= divisible by 9
=15+x+y=18
therefore =x+y=2
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