The Bornean orangutan is listed as Endangered and numbers approximately 41,000, while the Sumatran orangutan is considered Critically Endangered with an estimated population of 7,500. A century ago, more than 230,000 orangutans likely roamed in the wild.
Making the world better, one answer at a time. If you go to the United States Postal Service web-stie, you will find that one US First class stamp ($0.42) will cover the cost to mail a letter that weighs up to 1 ounce, about 28.35 grams. Thus, the average weight of a letter is one ounce or less. If you go to the United States Postal Service web-stie, you will find that one US First class stamp ($0.42) will cover the cost to mail a letter that weighs up to 1 ounce, about 28.35 grams.  Minor edit?
The stated weight is based on the number of sheets before they are cut, so a ream of 20-pound weight paper means 500 sheets weighs 20 pounds.Since each sheet equals four pieces of letter-size paper, your 20-pound baseline in this case is 500 sheets of four pieces each, for a total of 2000 pieces of letter-size paper.tep 4. Count the number of pieces of letter-size paper in the document you need to mail. Multiply this number by 0.16 ounces to obtain the total weight. For example, if your document is five pages, multiply five by 0.16 to get a total weight of 0.8 ounces.