Page:Paper and Its Uses.djvu/164

To find the Quantity of Paper required for an Edition of a Book of a Given Size.—An edition of a book of 400 pages demy octavo, 6,500 pages, is required. What quantity of double demy should be issued in perfect reams? A sheet of double demy will contain 32 pages; a ream will produce 500 copies.

Therefore, 6,500 x 400/32 x 500 = 162½ reams.

Or, 400 ÷ 32 = 12½ sheets per copy; 6,500 = 13 reams;
13 x 12½ = 162½ reams.

To Calculate the Weight of a Ream Containing a Larger or Smaller Number of Sheets.—Multiply the weight by the factor given below, or else add or subtract the fraction representing the difference in the number of sheets.

Table of Factors

Table of Factors.					Table of Fractions.[1]
To convert to	480	500	504	516	480	500	504	516
480	...	1.042	1.05	1.075	...	+ 1/24	+ 1/20	+ 3/40
500	.96	...	1.01	1.032	– 1/25	...	+ 1/125	+ 4/125
504	.95	.992	...	1.022	– 1/21	– 1/126	...	+ 1/42
516	.93	.969	.977	...	– 3/43	– 4/129	– 1/43	...

1. Add or subtract the fraction of the weight of the ream as shown.