Question 8the rate of whitewashing the wall is Rs- 20 per m 2-

Area of rectangular door = length × breadth = 2 m × 1m = 2 m^2 Area of wall including door = length × breadth = 4.5 m ×3.6 m = 16.2 m^2 Now, Area of wall exc ...

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Standard VII

Mathematics

Area of Square & Rectangle

Question 8the...

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Question 8

A door of length 2 m and breadth 1 m is fitted in a wall. The length of the wall is 4.5 m and the breadth is 3.6 m. Find the cost of whitewashing the wall, if the rate of whitewashing the wall is Rs. 20 per $m^{2}$ .

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Solution

Area of rectangular door = $l e n g t h \times b r e a d t h = 2 m \times 1 m = 2 m^{2}$
Area of wall including door = $l e n g t h \times b r e a d t h = 4.5 m \times 3.6 m = 16.2 m^{2}$
Now, Area of wall excluding door
= Area of the wall including door - Area of door
$= 16.2 - 2 = 14.2 m^{2}$
Since, the cost of whitewashing 1 $m^{2}$ of wall = Rs. 20
Therefore, the cost of whitewashing 14.2 $m^{2}$ wall = $20 \times 14.2$ = Rs. 284
Thus, the cost of whitewashing the wall excluding the door is Rs. 284

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Question 8 A door of length 2 m and breadth 1 m is fitted in a wall. The length of the wall is 4.5 m and the breadth is 3.6 m. Find the cost of whitewashing the wall, if the rate of whitewashing the wall is Rs. 20 per m2.

Question 8

A door of length 2 m and breadth 1 m is fitted in a wall. The length of the wall is 4.5 m and the breadth is 3.6 m. Find the cost of whitewashing the wall, if the rate of whitewashing the wall is Rs. 20 per $m^{2}$ .