Question

please give me the answer to this question

Answer 1

Height of door is 2m and Breadth is 1m
Length of wall is 4.5m and Height us 3.6m


so we could easily find the area of wall as well as door

Area of door l*b=2*1=2m²

Area of wall=l*b=4.5*3.6=16.2m²

Now we have to whitewash the area of only wall
so area of wall-Area of door=16.2-2=14.2m²

so now the cost of white washing the wall is Rs20/m²

which is 14.2*20=284₹

Cost of white washing the wall is Rs284

Answer 2

$\huge{\pink{\underline{\ulcorner{\star\:Solution\: \star}\urcorner}}}$

$\red{\underline{Door\: Specification\:\colon}}$

$l(length\: of \:door)=2m\\b (breadth\:of\:door)=1m\\Area \:of\:door=length\times breadth\\\implies 1\times 2\\\implies 2\:m^{2}$

Now for wall,

$\red{\underline{Wall\: Specification\:\colon}}$

$l(length\: of \:door)=4.5m\\b (breadth\:of\:door)=3.6m\\Area \:of\:door=length\times breadth\\\implies 4.5\times 3.6\\\implies 16.2 \:m^{2}$

$Area\: of \: remain\:wall\:after\: fitting\: of \: door\\\implies 16.2-2\\\implies 14.2 m^{2}$

Cost of white wash = ₹ 20 per m²

$Cost\:of\:white \: wash \:of \:14.2m^{2} = 14.2\times20\\\implies Rs\: 284$