Let l represent the length and w represent the width of the yard.
The property is twice as long as it is wide. hence:
l = 2w
The total area of her yard is 1,000 m². hence:
lw = 1000
2w(w) = 1000
w² = 500
w = 22.4 m
Hence the approximate width of her backyard is 22.4 m
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