Question

How many 128 x 8 ram chips are needed to provide a memory capacity of 2048 bytes?

Answer 1

according to question,

                    128 x 8 RAM means the Storage capacity of 1024 bits
 and   
                          1 bit = 0.125 Byte
 Thus,                1024 bits = 1024 * 0.125
                                         = 128 Byte
That means that 1 RAM chip has the storage capacity of 128 Byte
   Lets consider there are n number of Chips to provide 2048 Bytes
 Now,
                                  1 RAM Chip = 128 Byte
Thus,                          N RAM Chips = 2048 Bytes         
 
      Cross Multiplying the equations
                                     128 * n = 2048           

Thus,                              n = 16
            Therefore total number of chips required to provide the storage capacity of 2048 Bytes is 16 Chips