A laboratory is 9 m long- 8 m broad and 6 m high- It has 2 doors each of size 3 m- 1-5 m and four windows each of size 1-5 m- 1 m- find the cost of whitewashing the walls of the laboratory at the rate of Rs- 1-75 per sq- m-

Area of walls #160; = 2h (l+b) = 2× 6(17) = 204 m^2 Area of doors #160; = 2× 3× 1.5 = 9m^2 Area of window = 4× 1.5× 1 = 6 m^2 Area to be whit ...

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Standard X

Mathematics

Surface Area of Combined Figures

A laboratory ...

Question

A laboratory is $9 m$ long, $8 m$ broad and $6 m$ high. It has $2$ doors each of size $3 m \times 1.5 m$ and four windows each of size $1.5 m \times 1 m$ . find the cost of whitewashing the walls of the laboratory at the rate of $R s . 1.75$ per $s q . m$ .

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Solution

Area of walls $= 2 h (l + b) = 2 \times 6 (17) = 204 m^{2}$
Area of doors $= 2 \times 3 \times 1.5 = 9 m^{2}$
Area of window $= 4 \times 1.5 \times 1 = 6 m^{2}$
Area to be whitewashed $= 204 - 9 - 6 = 189 m^{2}$
Total cost $= 1.75 \times 189$
= 330.75 RS

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A laboratory is 9 m long, 8 m broad and 6 m high. It has 2 doors each of size 3 m×1.5 m and four windows each of size 1.5 m×1 m. find the cost of whitewashing the walls of the laboratory at the rate of Rs.1.75 per sq.m.

Area of walls =2h(l+b)=2×6(17)=204m2Area of doors =2×3×1.5=9m2Area of window =4×1.5×1=6m2Area to be whitewashed =204−9−6=189m2Total cost =1.75×189 = 330.75 RS

A laboratory is $9 m$ long, $8 m$ broad and $6 m$ high. It has $2$ doors each of size $3 m \times 1.5 m$ and four windows each of size $1.5 m \times 1 m$ . find the cost of whitewashing the walls of the laboratory at the rate of $R s . 1.75$ per $s q . m$ .

Area of walls $= 2 h (l + b) = 2 \times 6 (17) = 204 m^{2}$
Area of doors $= 2 \times 3 \times 1.5 = 9 m^{2}$
Area of window $= 4 \times 1.5 \times 1 = 6 m^{2}$
Area to be whitewashed $= 204 - 9 - 6 = 189 m^{2}$
Total cost $= 1.75 \times 189$
= 330.75 RS