The average salary of the employees in a office is Rs.120/month.The avg salary of officers is Rs.450 and of non officers is Rs 110. If the no.of officers is 15,then find the No of nonofficers in the office.
Pick one:	A) 400	B) 420	C) 430	D) 495	E) 510

Rationale: let no . of non - officers be x 15 * 450 + x * 110 = ( x + 15 ) 120 x = 495 d
Answer: D