Question

gate having dimensions 2 m X 1 m is in the wall of 3 m X 5 m. If the cost of colouring is Rs. 100 per m2 , find the total cost of colouring the wall.


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Answer 1

Answer:

Area of one wall =length×height=5×8=40 sq.m

Area of another adjacent wall =width×height=3×8=24 sq.m

Area of 4 walls =2×40+24×2−4.5−2.25=128−6.75=121.25

Cost of painting the four walls =121.25×25=3,031.25 Rs.

So, we don't require statement III.

hope it helps you✌

Answer 2

Answer:

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Chapters in NCERT Solutions - Mathematics, Class 7

Exercises in Perimeter and Area

Question 13

Q8) A door of length 2 m and breadth 1m 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 white washing the wall, if the rate of white washing the wall is Rs 20 per m^2

Solution

Transcript

Solution:

Length of wall= 4.5m

Breadth of the wall= 3.6m

Length of the door =2m

Breadth of the door= 1m

Area of the wall = l\times b=4.5m\times3.6m=\ 16.20m^2

Area of the door = l\times b=2m\times1m=2m^2

Therefore area of the wall to be white washed= Area of the wall - Area of the door

=Rs\ 14.20\times20=Rs\ 284.00

Hence, the required area= 14.20m^2 and the required cost= Rs 284