Number of pencils bough by the student = 84 Number of pencils sharpened by the student = 35 Then The number of pencils that was not sharpened = (84 - 35) = 49 So 35 pencils have been sharpened and 49 pencils have not been sharpened. Then Number of pencils unsharpened:Number of pencils sharpened = 49:35 = 7:5 So the ratio of the number of unsharpened pencil to the number of sharpened pencil is 7:5
