Experience and lots of reference books.
7x75=525
the amount in one package(envelope)of custard mix
Envelope
There are lots of different sizes of shipping packages. You can choose from: Letter, Large Envelope, thick envelope, Package, Large Package and Irregular packages.
A packager is a person who, or a tool which, packages things.
envelope
envelope
it is a envelope.
envelope
an envelope :)
A large package has any one of it's dimensions being greater than 12.
shake it