If 10/b + 20/b + 30/b is an integer, which of the following must also be an integer? Choose the correct choice from the following answers
A) 20/b
B) b/16
C) 60/b
D) 4b
E) 4+b
If 10/b + 20/b + 30/b; then (10+20+30)/b is also integer.   i.e. 60/b is an integer.   Answer is 60/b
<result>C</result>
If 10/b + 20/b + 30/b is an integer, which of the following must also be an integer?