Question

the lenght of a room is two and half times is width .if the perimeter of the room is 70 m ,find lenght of the room ?

Answer 1

HEY!!!!!

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let the length and width of room be x and y respectively

so it is given that

x=2.5y

or x=5/2y or 2x=5y__________(1)

also ,

perimeter of a for rectangle is 2(x+y)

so 2(x+y)=70

or

x+y=35 _____________(2)

from (1)

x=2/5y

substituting in (2)
we get

2/5y+y=35

=(2y+5y)/5=35

=7y=5×35

y=25

from (2)

x=35-y

x=35-25=10

so

x=10 and y = 25

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Thanks !!!

Answer 2

2(l+b)=70
2(2×1/2+x)=70
2(5/2+x)=70
5/2+x=70/2
5/2+x=35
5+x=35×2
5+x=70
x=70-5= 65width
then
2 1/2=5/2
5/2×65=162.5
width is= 65 and lenth is 162.5
I think it's help you