Question 784978
let width be w

length = 4w

length increased by 4=>4w+4

width decreased by 1=>w-1

Area = 60

Area = l*w

(w-1)(4w+4)=60

(w+1)*4(w-1)=60

(w+1)(w-1)=60/4

w^2-1=15

w^2=15+1

w^2=16
w=+/-4

ignore negative length

w=4 in

length = 4*4 = 16in