ANSWER
4 : 7
Step-by-step explanation
Katie has 4 grape candies and 3 cherry candies.
The total number of candies Katie has is:
4 + 3 = 7
The ratio of the number of grape candies to the total number of candies will be given in the form:
a : b
where a is the number of grape candies
b is the total number of candies
Therefore, the ratio of grape candies to the total number of candies is:
4 : 7