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supernet mask of class c is given 255.255.224.0 .the number of networks that can be joined are

  1. 16
  2. 32
  3. 64
  4. none

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I think here they are asking how  much extra 1’s we can use in the network or how much bits we can borrow from the host to make 1’s.

here the given network id is 255.255.224.0.

and as per the standard the subnet mask of class C is 255.255.255.0

224 = 11100000  and 255 = 11111111

thus as we have 5 bits to be included in the network id .

so from 5 bits we can add 2^5 networks  i.e 32 networks.

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