the diameter of a 2.5 m long roller is 92 cm . if its take 150 revolution to level a playground then find the approximate cost of levelling the ground at the rate of 60 paise per square meter ( π - 22 /the diameter of a 2.5 m long roller is 92 cm . if its take 150 revolution to level a playground then find the approximate cost of levelling the ground at the rate of 60 paise per square meter ( π - 22/7 )
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