How to design a Design a 32 x 4 memory using two 16 x 4 RAM chips
As this sounds like a homework question I'll give you something to start your answer.

32 x 4 means 32 unique addresses (that is 5 bit address) with a 4 bit data lines. Similarly 16 x 4 would be 16  unique addresses (that is 4 bit address) with 4 bit data lines.