[" Thus,the work is completed in "25" days."],[" Example "A" long a road lie an odd number of stones placed at intervals of "10" metres.These stones "],[" to be assembled around the middle stone.A person can carry only one stone at a time.A man carriees "],[" with one of the end stones by carrying them in succession.In carrying all the stones he covered "a_(" distan ")],[" of "3km" .Find the number of stones."],[" SOIUTION Let there be "(2n+1)" stones.Clearly,one stone lies in the middle and "n" on "]