"The central hall of a school is 80m long and 8m   high. It has 10 doors each of size `
Channel: Doubtnut
Date: 2020-07-05

"The central hall of a school is 80m long and 8m
 
  high. It has 10 doors each of size `3m xx1. 6 m`
 
 and 10 windows each of size `1. 5 m xx 1mdot`
 
 If the cost of white-washing the walls of the
 
  hall at the rate of `R s .1.20\ p e r\ m^2`
 
 is Rs. 2385.60, find the breadth of the hall."