Where is BLAS and LAPACK installed - the directory?

I am trying find which directory path BLAS and LAPACK are installed on.

I tried:

$ type libblas-dev
bash: type: libblas-dev: not found

Then:

$ apt-cache policy libblas-dev
libblas-dev: Installed: 3.6.0-2ubuntu2 Candidate: 3.6.0-2ubuntu2 Version table: *** 3.6.0-2ubuntu2 500 500 xenial/main amd64 Packages 100 /var/lib/dpkg/status

But the last code doesn't show where it is installed. Can anyone help with this?

The same is the case with LAPACK:

$ type liblapack3
bash: type: liblapack3: not found

and

$ apt-cache policy liblapack3
liblapack3: Installed: 3.6.0-2ubuntu2 Candidate: 3.6.0-2ubuntu2 Version table: *** 3.6.0-2ubuntu2 500 500 xenial/main amd64 Packages 100 /var/lib/dpkg/status

The command:

$ dpkg -L liblapack3

gives:

/.
/usr
/usr/lib
/usr/lib/lapack
/usr/lib/lapack/liblapack.so.3.6.0
/usr/share
/usr/share/doc
/usr/share/doc/liblapack3
/usr/share/doc/liblapack3/copyright
/usr/share/doc/liblapack3/testing_results.txt.gz
/usr/share/doc/liblapack3/README.gz
/usr/lib/lapack/liblapack.so.3
/usr/share/doc/liblapack3/changelog.Debian.gz

But how do I know where the executable file is ? i.e. the install directory.

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