Answer:
Number of limes are 20 
Number of oranges are 22 
Number of cherries are 26
Explanation:
number of pieces of total candies = 68 
Let the number of limes is y. 
Number of orange = y + 2 
Number of cherry = 4 + y + 2
So, 
According to the question 
y + y + 2 + 4 + 2 + y = 68 
3 y + 8 = 68 
3y = 60 
y = 20 
Number of limes are 20 
Number of oranges are 22 
Number of cherries are 26