Breeding of a certain species of insect is incredible—everyday the total number of such insects in a closed glass jar is double the number on the previous day. There was just one insect in the jar on 1.2.2007, and the jar was full to the brim with these on 28.2.2007. On which date of February was the jar quarter-full ?

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Breeding of a certain species of insect is incredible—everyday the total number of such insects in a closed glass jar is double the number on the previous day. There was just one insect in the jar on 1.2.2007, and the jar was full to the brim with these on 28.2.2007. On which date of February was the jar quarter-full ?






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