420  Stamp
How many stamps? 1

Name : _________________

refresh

There are 170 stamps which are 6-cent stamps and 7-cent stamps. Altogether they cost 1100 cents. How many 6-cent stamps are there?



There are 200 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 1300 cents. How many 6-cent stamps are there?



There are 170 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 750 cents. How many 5-cent stamps are there?



There are 180 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1140 cents. How many 5-cent stamps are there?



There are 160 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 890 cents. How many 5-cent stamps are there?

There are 140 stamps which are 5-cent stamps and 4-cent stamps. Altogether they cost 640 cents. How many 5-cent stamps are there?



There are 190 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 900 cents. How many 6-cent stamps are there?



There are 180 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 1100 cents. How many 5-cent stamps are there?



There are 200 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 990 cents. How many 3-cent stamps are there?



There are 170 stamps which are 3-cent stamps and 6-cent stamps. Altogether they cost 780 cents. How many 3-cent stamps are there?

+(         )

(         )+

++[[          ]]++