What is the last address of a block of classless addresses i

What is the last address of a block of classless addresses if one of the addresses is 192.168.2.137/27?
Broadcast address=
Last usable address =

briefly explain your answers

Solution

Here the mask have 27 1s and (32-27) 5 0s. The complement of the mask will have 27 0s and 5 1s which means the mask complement will be
00000000 00000000 00000000 00011111
or 0.0.0.63
and we will add the mask complement to begining of address to find the last address
192.168.2.137
0. 0.0. 63
192.168.2.200

Hence the last address is 192.168.2.200