A room is 6-2m long- 3-8m wide and 3-2 m high- It has 2 doors each 2m- 1-2 m and 2 windows each 1-2m - 1-5 m- Find the cost of white-washing its walls at the rate of Rs- 10 per square metre-

Area of walls to be white washed =2(l+b)× h area of doors area of window =2(6.2+3.8)× 3.2 2× 2× 1.2 2× 1.2 × 1.5 =64 4.8 3.6=55.6m^2 Cost o ...

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Standard VIII

Mathematics

Total Surface Area of a Cuboid

A room is 6...

Question

A room is $6.2$ m long, $3.8$ m wide and $3.2$ m high. It has $2$ doors each $2 m \times 1.2 m$ and $2$ windows each $1.2 m \times 1.5 m$ . Find the cost of white-washing its walls at the rate of Rs. $10$ per square metre.

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Solution

Area of walls to be white-washed $= 2 (l + b) \times h - a r e a o f d o o r s - a r e a o f w i n d o w = 2 (6.2 + 3.8) \times 3.2 - 2 \times 2 \times 1.2 - 2 \times 1.2 \times 1.5 = 64 - 4.8 - 3.6 = 55.6 m^{2}$
Cost of white wash $= R s (10 \times 55.6) = R s 556$

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A room is 6.2m long, 3.8m wide and 3.2 m high. It has 2 doors each 2m×1.2m and 2 windows each 1.2m×1.5m. Find the cost of white-washing its walls at the rate of Rs.10 per square metre.

Area of walls to be white-washed =2(l+b)×h−areaofdoors−areaofwindow=2(6.2+3.8)×3.2−2×2×1.2−2×1.2×1.5=64−4.8−3.6=55.6m2Cost of white wash =Rs(10×55.6)=Rs556

A room is $6.2$ m long, $3.8$ m wide and $3.2$ m high. It has $2$ doors each $2 m \times 1.2 m$ and $2$ windows each $1.2 m \times 1.5 m$ . Find the cost of white-washing its walls at the rate of Rs. $10$ per square metre.

Area of walls to be white-washed $= 2 (l + b) \times h - a r e a o f d o o r s - a r e a o f w i n d o w = 2 (6.2 + 3.8) \times 3.2 - 2 \times 2 \times 1.2 - 2 \times 1.2 \times 1.5 = 64 - 4.8 - 3.6 = 55.6 m^{2}$
Cost of white wash $= R s (10 \times 55.6) = R s 556$