- My phone rang.
- Who's calling?
- The Elephant.

Then the Crocodile called, then the Bunny, then the Monkeys, then the Bear, then the Herons... So, the Elephant, Crocodile, Bunnies, Monkeys, Bear, Herons, and I all have phones. Every two phone devices are connected by a wire. How many wires are needed for this?

#
Notice, each wire connects two devices.

## Solution

There are a total of 7 telephones, each connected to six others. Therefore, there are 42 connections in total. Since a wire represents 2 connections, a total of 21 wires were needed.

## Answer

21 wires.