9 students bought burgers for $143 dollars. If the bill has to be divided among these students, how much amount should be added to the amound to make it
divided amoung them equally in dollars(in whole number of dollars) Choose the most appropriate option.
A) $ 1 B) $ 2 C) $ 3 D) $ 4 E) $ 5

Rationale: in order to divide the sum in 9 parts , the amount must be divisible by 9 divisibility rule of 9 : the sum of the digits must be divisible by 9 sum of digits of 143 = 8 and 9 is divisible by 9 . hence , we need to add 1 to this number for it to be divisible by 9 correct option : a
Answer: A