Number of waffle cones sold on Monday = 14
Number of sugar cones sold on Monday = 6
So, the proportion of waffle cones to sugar cones = 14 : 6 = 7 : 3.
Number of waffle cones sold on Tuesday = 7
Number of sugar cones sold on Tuesday = 3
So, the proportion of waffle cones to sugar cones = 7 : 3.
Hence, the required proportion that can be used to represent the cone sales is 7 : 3.