Three pages at most.
79 pages in this book
6 including the envelope.
Postage is .45 for a letter 1oz. or less and a large envelope weighing 1oz. or less is .90
On average, a one-ounce letter has about 6-8 pages of paper. The number of pages can vary depending on the paper thickness and size, but this is a common estimate.
about 28349.5231
1.
1gram=9 cal of fat. 9x28.35 grams(1oz)=255.15 cal
0.0283 kg.
Depends on the weight of the paper and envelope. One first class stamp is good for up to 1oz. That can be 6+ pages of thin cheap notebook paper, or as few as 3-4 pages of high quality stationary. Every post office will have a scale that you can use to determine correct postage and be sure, but if you can fit those 13 pages in a regular #10 envelope, you're going to need 3 stamps to be sure.
20 pennyweight.
That is 28.34 grams
0.05 Imperial pints.