Question

23
The average salary of the entire staff in a office is Rs.220
per day. The average salary of officers is Rs.650 and that
of non-officers is Rs. 170. If the number of officers is
25, then find the number of non-officers in the office.
(a) 215
(b) 315
(c) 250
(d) 350
​

Answer 1

Answer:

a) 215

let no. of non officer = x

average salary of the entire staff in a office is Rs.220

number of officers = 25

average salary of officers= Rs650

salary of 25 officers = 650*25

= Rs 16250

Equation

220 (25 +x ) = 16250 + 170x

Explanation:

5500 +220x = 16250 + 170x

220x -170x = 16250 -5500

50x = 10750

x = 10750/50

x = 215

number of non-officers in the office. = x =215