While Ruby can't combine different data types like strings and numbers, it can convert them. After that, we can combine them.

See that? to_s is a so-called method that converts number's value into a string. It's not a permanent change, though, so we have to reassign the value to number.

Yikes! Because we want to use the to_s method to convert the number, we need to add a full stop between the variable and the number.