X,Y,Z are consecutive inetegers . Is X + Y + Z divisible by 10?
1) X + Z divisible by 10
2) Y is a multiple of 10
1) X + Z divisible by 10
2) Y is a multiple of 10
1) x = y-1 , z = y+1 since x,y & z are cons. nos.
x+y = 2y is divisible by 10 i.e. y is multiple of 5
let it be 5a , then x+y+z = (5a-1)+5a+(5a+1) = 15a
not sufficient.
2) let y a multiple of 10 = 10 a
x+y+z = (10a-1)+10a+(10a+1) = 30a
which is divisible by 10
Sufficient
IMO B
