Question

the size of a classroom is 6m by 5m by 4m. Leaving one door of size 2m by 1m and two windows of size 1m by 60cm,the four walls were painted by an artist.How much would he charge at the rate of rupees 10 per square meter

Answer 1

AREA OF WALL(1)=6*5=30M SQ.
                           (2)=5*4=20M SQ.
:. AREA OF FOUR WALLS = 30+30+20+20=100M SQ.
AREA OF DOOR = 2*1=2 M SQ
AREA OF WINDOWS = 2*1*0.60=1.20MSQ
AREA TO BE PAINTED= 100-(2+1.2)=97.8M SQ
RATE =RS 10
TOTAL COST = RS(10*97.8)=RS 978

Answer 2

area of four wall =2(l+b)*h
=2(6+5)*4
=22*4=88m^2
areas of door =2*1=2m^2
area of window =1*0.6=0.6m^2
painting area = 88-(2+0.6)=85.4m^2
cost for painting =85.4*10=854rupee