The number of cherries that Greg would need to make 9 perfect cherry pies is 720 cherries.
In Mathematics and Geometry, a direct proportion refers to a mathematical equation which is typically used to represent the equality of two (2) ratios.
By applying direct proportion to the given information, we have the following mathematical equation:
240 cherries = 3 pies
x cherries = 9 pies
By cross-multiplying, we have the following:
3x = 240 Ă— 9
3x = 2160
x = 2160/3
x = 720 cherries.
In conclusion, the ratio of cherries to pies can be written as follows;
240 : 3
8 : 1