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[" 13.A rectangular field is to be fence...

[" 13.A rectangular field is to be fenced on three sides leaving a side of "20" feet uncovered."],[" If the area of the field is "680" sq.feet,how many feet of fencing will be required? "],[[" (a) "34," (b) "40," (c) "68," (d) "88],[" (R.R.B."," 2002) "]]

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