The area of a rectangle or ice skating rink is 900 yd.² if the length of the rink is 100 yards what is the width of the rink

With of the rink is 9 yards.

Area of a rectangle is computed by multiplying length by its width.

A = lw

A = 900 yd²
l = 100 yd
w = ?

900 yd² = 100yd * w
900 yd² / 100 yd = w
w = 9 yd

to check: 
900 yd² = 100 yd * w
900 yd² = 100 yd * 9 yd
900 yd² = 900 yd²

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4pounds of live bait and 1 pound of natural bait