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Using echo "20+5" literally produces the text "20+5"

What command can I use to get the numeric sum, e.g. 25 in this case.

Also, what's the easiest way to do it just using bash for floating point, e.g.
echo $((3224/3807.0)) gives 0 :(

Using either the basic command shell ('command line') itself or through using languages that are available at the command line.

Using echo "20+5" literally produces the text "20+5".

What command can I use to get the numeric sum, 25 in this case?

Also, what's the easiest way to do it just using bash for floating point? For example, echo $((3224/3807.0)) prints 0 :(.

I am looking for answers using either the basic command shell ('command line') itself or through using languages that are available from the command line.