472  Stamp
How many stamps? 1

Name : _________________

refresh

There are 150 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 780 cents. How many 4-cent stamps are there?



There are 180 stamps which are 5-cent stamps and 8-cent stamps. Altogether they cost 1230 cents. How many 5-cent stamps are there?



There are 150 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 870 cents. How many 7-cent stamps are there?



There are 240 stamps which are 5-cent stamps and 9-cent stamps. Altogether they cost 1680 cents. How many 5-cent stamps are there?



There are 140 stamps which are 5-cent stamps and 6-cent stamps. Altogether they cost 760 cents. How many 5-cent stamps are there?

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



There are 270 stamps which are 4-cent stamps and 6-cent stamps. Altogether they cost 1340 cents. How many 4-cent stamps are there?



There are 200 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 780 cents. How many 5-cent stamps are there?



There are 140 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 810 cents. How many 4-cent stamps are there?



There are 230 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1220 cents. How many 4-cent stamps are there?

+(         )

(         )+

++[[          ]]++