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- A) Yes sum is 9
B) Yes sum =42=12=3
C) No Sum is 70 - A) Yes - 3+8=11
B) No Sum = 108
C) Yes Sum = 165 - A) Not divisible by 3 so 909 is out
B) Yes sum is divisible by 9 but not sure of trick to find out about 909. because common factors are 9 and 101
c) Yes Sum is divisible by 9 but not sure of trick to find out about 909
4 A) 13
B) 27, ?,?,?
RE: Math Contest #13 [1 SBI + 20 or more STEM] Guaranteed prize for participation!