Answer :

172.0.0.0/27

If you're looking to add a new subnet to your AWS VPC that will allow you to host a total of 20 EC2 instances, you'll want to use the 172.0.0.0/27 IPv4 CIDR block. This will give you the necessary IP addresses to accommodate your desired instance count. To add the subnet, simply follow the instructions in the AWS console.

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