Chief is the opposite of Indian. you are likely to find Indian in/at/on Casino. you are likely to find Game in/at/on Casino. Game can be Silly. 
Solution is related to Answer. Answer is related to Ask. Ask is the opposite of Reply. 
Chief <--Antonym--> Indian --AtLocation--> Casino <--AtLocation-- Game --HasProperty--> Silly 
Solution <--RelatedTo--> Answer <--RelatedTo--> Ask <--Antonym--> Reply 