Answer :
Area of a rectangle:
A = lw
9/10 = 1/5l
Divide 1/5 to both sides:
l = 9/10 / 1/5
Flip the 2nd fraction and multiply:
l = 9/10 * 5/1 = 45/10 = 4.5
So:
Length = 4.5 or 4 1/2
Width = 0.2 or 1/5
Area = 0.9 or 9/10
A = lw
9/10 = 1/5l
Divide 1/5 to both sides:
l = 9/10 / 1/5
Flip the 2nd fraction and multiply:
l = 9/10 * 5/1 = 45/10 = 4.5
So:
Length = 4.5 or 4 1/2
Width = 0.2 or 1/5
Area = 0.9 or 9/10