Question 376473
a) Digits add to {{{5+6+7+4+3=25}}} which is not divisible by 3, so the number is not divisible by 3.
Doesn't end in 0 or 5 so no chance with 5.
Also not divisible by 11.
.
.
.
b) Digits add to {{{6+9+9+1+6+8=39}}} which is divisible by 3, so the number is divisble by 3.
Ends in 0 so it's divisible by 5. 
Not divisible by 11.