Question

plz solve Q-13,14 and 15

I'll mark as BRAINLIEST ​

Answer 1

Answer:

Correct option is A)

Length of room (l)=5m

Breadth of room (b)=35dm=3.5m

Area to be carpeted =l×b=5×3.5=17.5m2

∴ Area of carpet =17.5m2

Width of carpet =7dm=0.7m

∴ Length of carpet =width of carpetArea of carpet=0.717.5=25m=250dm

Hence, the length of the carpet required (in dm) is 250.

this is 15 th one

Correct option is A)

Given:Length (l)=6.2m

Height (h)=3.2m

Width (b)=3.8m

∴ Area of four walls =2(l+b)h=2(6.2+3.8)×3.2=64m2

Given that the has 2 doors each 2m×1.2m and 2 windows each 1.2m×1.5m. 

Area of 2 doors =2×(2×1.2)=4.8m2

Area of 2 windows =2×(1.2×1.5)=3.6m2

∴ total area to be white-washed = area of four walls - (area of doors + area of window) 

∴ total area to be washed =64−(4.8+3.6)m2=64−8.4=55.6m2

Given that the cost of white-washing its walls at the rate of Rs.10 per square metre.

∴ The rate of white-washing 55.6m2 area =55.6×10=Rs.556

Hence, the correct answer is 556.

14 th one

Answer 2

Answer:

13)Given:Length (l)=6.2m

Height (h)=3.2m

Width (b)=3.8m

∴ Area of four walls =2(l+b)h=2(6.2+3.8)×3.2=64m

^2

Given that the has 2 doors each 2m×1.2m and 2 windows each 1.2m×1.5m.

Area of 2 doors =2×(2×1.2)=4.8m

^2

Area of 2 windows =2×(1.2×1.5)=3.6m

^2

∴ total area to be white-washed = area of four walls - (area of doors + area of window)

∴ total area to be washed =64−(4.8+3.6)m

^2

=64−8.4=55.6m

^2

Given that the cost of white-washing its walls at the rate of Rs.10 per square metre.

∴ The rate of white-washing 55.6m

^2

area =55.6×10=Rs.556

Hence, the correct answer is 556.

14)Area of rectangle =l×b

The area of 1 tile =10×14=140cm

^2

=0.014m

^2

The area of wall =2.8×4=11.2m

^2

No. of tiles required to cover a wall of size 11.2m

^2

= 0.014

11.2

=800

Hence, 800 tiles will be required to cover a wall of size 2.8m×4m.

15)Length of room (l)=5m

Breadth of room (b)=35dm=3.5m

Area to be carpeted =l×b=5×3.5=17.5m

^2

∴ Area of carpet =17.5m

^2

Width of carpet =7dm=0.7m

∴ Length of carpet =

width of carpet

Area of carpet= 0.7

17.5

=25m=250dm

Hence, the length of the carpet required (in dm) is 250.

hope it helps

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