create calculations for my PDF Adobe Acrobat file simple work

The attached PDF file needs some simple calculations put in there. I've already created the fields in the document but I cannot figure out how to create calculations between the fields. I also need unnecessary pages deleted from the documents. Deletion....Delete all pages except for the first page and form G. Calculations... User input: User input really only requries 4 bits of data… so if you can create this where it asks for these for bits of data up front, then auto calcuates everything else, that is what we want (4 bits of data user needs to input are 1) Gross Weight 2) 10-piece weight 3) number of bags 4) Date On First Page Number of Bags (user input) Gross wieght (hidden field with user input… this field needs to be created) minus ("number of bags" field * 2.4652) equals "total weight field" 10-piece weight (hidden field with user input… this field needs to be created) divided by 10, divided by 16, equals the "per piece weight" field on page 1 (this needs to be a four decimle number) Date Field should default to todays date field for total pieces should be calculated from the total weight field (not gross weight) and the weight per piece fields on page G. the line G. 17 will need these auto calculations: number of pieces will be obtained from page 1, pieces subtotal will be calculated from the number of pieces times .886, hounds will be obtained from page 1, hounds subtotal will be hounds times .633, the total will be a combination of pieces subtotal added to the pounds subtotal. Lastly you can see at the bottom of page G. there is a total field that also means the total amount inserted there as well. Back to the First Page Now for the next thing, once this is done some of this data will need to be put in the fields on page 1: the total from page G. will also be inserted on page 1 for the fields total postage, net postage due, and total adjusted postage permit imprint