There are 270 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1860 cents. How many 6-cent stamps are there?
There are 170 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 840 cents. How many 6-cent stamps are there?
There are 170 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1130 cents. How many 4-cent stamps are there?
There are 180 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 980 cents. How many 5-cent stamps are there?
There are 160 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 720 cents. How many 4-cent stamps are there?
|
There are 260 stamps which are 8-cent stamps and 7-cent stamps. Altogether they cost 1970 cents. How many 8-cent stamps are there?
There are 190 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1200 cents. How many 6-cent stamps are there?
There are 200 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1400 cents. How many 5-cent stamps are there?
There are 150 stamps which are 7-cent stamps and 6-cent stamps. Altogether they cost 990 cents. How many 7-cent stamps are there?
There are 230 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1630 cents. How many 5-cent stamps are there?
|