Math HW!!! PLEASE HELP!!!!?

I'm going to assume the 230 lbs refers to the apples and the crate.  Let X be the weight of apples and Y is the weight of the crate.

X + Y = 230 lbs

0.2X + Y = 90 lbs

Substract the second equation from the first.

0.8X = 140 lbs

X = 175 lbs.  The crate weighs 55 lbs

check

If 4/5 of the apples are sold, 1/5 remains or 35 lbs.  35 lbs + 55 lbs = 90 lbs 

let c = weight of crate and a = weight of apples

Initially the full crate of apples weights 230 lbs:

c + a = 230

After 4/5 of the apples are sold, the crate and the remaining 1/5 of the apples weighs 90 lbs.

c + a/5 = 90 : multiply by 5

5c + a = 450

Difference of the two equations:

5c + a - (c+a) = 450 - 230

4c = 220

c = 55 lbs

The crate weighs 55 lbs.

A full crate of apples weighed 230 pounds. 

  After 4/5 of the apples were sold, 

  the remaining apples and crate weighed 90 pounds. 

  The weight of the crate when empty is ________ pounds.

   The weight apples + weight of crate = 230 pounds

   The weigh of 1/5 apples + weight of crate = 90 pounds

   4/5 apples' weight = (230 - 90) pounds  

   The apples' weight = (140)(5/4) = 175 pounds

   The weight of the crate = (230 - 175) pounds = 55 pounds