This is confusing to me unless I am not seeing the bigger picture.
It says configure the router Ip addresses on the E0 and S0 interfaces so that the E0 receives the 11th usable subnet while the S0 receives the 4th usable subnet from the network 192.168.191.0/28. Both interfaces should receive the last available Ip address on the appropriate subnet. Note: The Zero Subnet should not be considered usable for this Scenario
Answer: 192.168.191.14 (4th Subnet) and 192.168.191.30(11th Subnet)
My answer 192.168.191.48 (4th Subnet) and 192.168.191.160(11th Subnet) Magic number is 16 from 255.255.255.240/28 (256-240=16)
48-63 (4th Subnet) 192.168.191.48
160-175 (11th Subnet) 192.168.191.160