Of the 30 employees of a certain company, twice as many are in the sales department as are in all of the other departments combined. What is the number of employees in the sales department?
Answers:  A) 15  B) 20  C) 30  D) 40  E) 45
This is ratio problem solving question.   I will prefer to use RMV box.   R M V   Sales 2 10 20   Other 1 10 10   Total 3 10 30   Answer is 20. i.e 20
<result>B</result>
Of the 30 employees of a certain company, twice as many are in the sales department as are in all of the other departments combined. What is the number of employees in the sales department?