103  Stamp
How many stamps? 1

Name : _________________

 

refresh

There are 260 stamps which are 4-cent stamps and 7-cent stamps. Altogether they cost 1370 cents. How many 4-cent stamps are there?



There are 140 stamps which are 5-cent stamps and 7-cent stamps. Altogether they cost 800 cents. How many 5-cent stamps are there?



There are 190 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1470 cents. How many 6-cent stamps are there?



There are 200 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1660 cents. How many 7-cent stamps are there?



There are 200 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1520 cents. How many 7-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 220 stamps which are 4-cent stamps and 3-cent stamps. Altogether they cost 810 cents. How many 4-cent stamps are there?



There are 190 stamps which are 5-cent stamps and 3-cent stamps. Altogether they cost 770 cents. How many 5-cent stamps are there?



There are 230 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1320 cents. How many 4-cent stamps are there?



There are 230 stamps which are 4-cent stamps and 5-cent stamps. Altogether they cost 1020 cents. How many 4-cent stamps are there?



+(         )

 

(         )+

++[[          ]]++

103    150 90 80 70 140 ( 530 )   150 150 100 150 130 ( 680 )   [[ 1210 ]]