There are 210 stamps which are 3-cent stamps and 8-cent stamps. Altogether they cost 980 cents. How many 3-cent stamps are there?
There are 220 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 970 cents. How many 4-cent stamps are there?
There are 210 stamps which are 3-cent stamps and 9-cent stamps. Altogether they cost 1410 cents. How many 3-cent stamps are there?
There are 220 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 1460 cents. How many 7-cent stamps are there?
There are 230 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1190 cents. How many 4-cent stamps are there?
|
There are 130 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 470 cents. How many 4-cent stamps are there?
There are 220 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 1280 cents. How many 4-cent stamps are there?
There are 200 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 880 cents. How many 3-cent stamps are there?
There are 190 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1410 cents. How many 8-cent stamps are there?
There are 240 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 870 cents. How many 4-cent stamps are there?
|