The Kelly family bought a new pet rabbit. They want to build an enclosure outside so it has lots of room to roam. They have 30 feet of leftover lumber to use. Find the length and width of the enclosure if the length is to be 4fteet longer than twice the width.

Assume that since this is a simple math problem and they only mentioned legnth and witdth,

assume a perfect rectangle

so assuming they use all the lumber

30=perimiter

perimiter=legnth around=legnth+legnth+with+width

30=2legnth+2width

undistribute

30=2 (legnth+width)

divide by 2

15=legnth+width

legnth is 4 more than 2width

legnth=4+2width

subsitute

15=legnth+width

15=4+2width+width

subtract 4

11=2width+width

divide by 3

11/3=width

legnth=4+2width

legnth=4+2 times (11/3)

lefnth=4+22/3

4=12/3

legnth=12/3+22/3

legnth=34/3 feet=11 and 1/3 foot

width=11/3=3 and 2/3

legnth=11 and 1/3 foot

width=3 and 2/3 foot