Answer:
1800: residents in each group
019: residents not fitting into a group
Explanation:
57 divides into 102 one time.
57 divides into 456 eight times. Bring down the 1.
57 divides into 1 zero times. Write 0 in the quotient. Bring down the 9.
57 divides into 19 zero times. Write 0 in the quotient.
There are no more digits to bring down. The remainder is 19.