5. The average monthly salary of all the employees in a factory is Rs. 400 and that

of the 15 officers is Rs. 4000. If the average monthly salary of workers is Rs. 300,

then what is the number of workers, leaving aside officers in the factory?

(A) 540

(B) 550

(C) 600

(D) 450

(D) 450

4000 ÷ 400 = 10

300 × 15 = 4500

4500 ÷ 10 = 450