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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