It is impossible to answer the question without information on:
which country you are in;
which country the envelop is going to;
how much it weighs;
what the envelop contains (some countries offer lower rates for printed material);
whether you have opted for the faster or fastest mail service.
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For specific information use theUSPS Link: http://www.usps.com/tools/calculatepostage/welcome.htm?from=global&page=0061calculatepostageIn general, you can mail any envelope up to 11x15 to qualify for first class postage, you then are charged by weight.In general, up to 8 sheets of 8.5x11 paper including envelope will require 2 stamps, 9-15 3 stamps.
The length is 7 inches and the width is 5 inches for a envelope
Let ' T ' = the number of 3-cent stamps. Furthermore, let ' F ' = the number of 5-cent stamps. T + F = 51, ===> so F = 51 - T 3T + 5F = 223 3T + 5(51-T) = 223 3T + 255 - 5T = 223 -2T = -32 T = 16 ===> so F = 35
Two ways only. 4 rows with 25 stamps each or 5 rows with 20 stamps each.
Depends on where it is going to!