Answer: Callie has 18 tulips this week.
Explanation:
Given: For 1 daisy, Callie picks tulips = 4
if she picks 3 daises then the total number of tulips she picked=

Also, her mother gave her 6 tulips this week from her garden, thus the total number of tulips she has now= 12+6=18
Therefore the total number of tulips this week Callie has= 18.