The width of the garden is: `x/3` `-` `5` ( dm )
According to the threads we have:
`x(x/3-5)``=`252`
`⇔` `1/3x^2``-``5x``-``252``=``0`
`⇔` `x=36` ( dm )
`⇔` The width of the garden is: `36/3``-``5``=``12``-``5``=``7` ( dm )
`⇔` The perimeter of this garden is: `(36+7).2``=``84` ( dm )
@ chú lân