420  Stamp
How many stamps? 2

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There are 200 stamps which are 8-cent stamps and 6-cent stamps. Altogether they cost 1480 cents. How many 8-cent stamps are there?



There are 210 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 1130 cents. How many 6-cent stamps are there?



There are 150 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1050 cents. How many 6-cent stamps are there?



There are 210 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1250 cents. How many 7-cent stamps are there?



There are 180 stamps which are 7-cent stamps and 5-cent stamps. Altogether they cost 1140 cents. How many 7-cent stamps are there?

There are 270 stamps which are 3-cent stamps and 7-cent stamps. Altogether they cost 1330 cents. How many 3-cent stamps are there?



There are 210 stamps which are 8-cent stamps and 9-cent stamps. Altogether they cost 1800 cents. How many 8-cent stamps are there?



오늘 6원짜리 7원짜리 우표 총 220 장을 사고, 1390 원을 지불 했을때, 몇개의 6원짜리 우표를 샀는가?



There are 160 stamps which are 6-cent stamps and 3-cent stamps. Altogether they cost 720 cents. How many 6-cent stamps are there?



There are 150 stamps which are 6-cent stamps and 9-cent stamps. Altogether they cost 1050 cents. How many 6-cent stamps are there?

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420    140 80 100 100 120 ( 540 )   140 90 150 80 100 ( 560 )   [[ 1100 ]]