What is the greatest 5-digit number when divided by 6, 7 ,8 , 9, and 10 leaves a remainder of 4, 5, 6, 7, and 9 respectively?	Pick one.
A) 56780	B) 78910	C) 97479	D) 97918	E) 97920

Rationale: when you divide a positive integer by 10 , the remainder will just be the units digit . we know the remainder is 9 when we divide by 10 , so c is the only possible answer .
Answer: C