Question

the length of a rectangular playground is twice to its width. The perimeter is 30. Find its dimension.please solve in matrix [ inversion method]

Answer 1

Length=2* width
L=2b--------(1)
Perimeter=2*(l+b)------(2)=30
Sub(1) in (2)
2*(2b+b)=30
3b=15
b=5
So length=10 (sincel l=2b)
Breadth=5
Hope it helps you

Answer 2

Hey!

Let the length of the playground be x.
Therefore it's width =x/2
Perimeter of the ground =2(l+b)
=>30=2(x + x/2)
=>30=2*(3x/2)
=>3x=30
=>x=10
Length =10
Hence it's breadth =1/2 of 10 =5

Hope it helps you :)