The correct options are
A Maximum value of x−y is 9
B maximum value of x+y is 12
C ∑(x+y)=60
8,7,6,4,2,x and y
any number is divisible by 3 if sum of digits is divisible by 3
i.e,. x+y+27 is divisible by 3
∴x+y is divisible by 3.
Possible pairs are (5,1)(3,0)(9,0)(9,3) and (1,5),(0,3)(0,9)(3,9)
∴∑(x+y)=60