|
620 Stamp |
Name : _________________ |
||
|
There are 190 stamps which are 7-cent stamps and 9-cent stamps. Altogether they cost 1490 cents. How many 7-cent stamps are there? |
There are 220 stamps which are 7-cent stamps and 4-cent stamps. Altogether they cost 1240 cents. How many 7-cent stamps are there? |
|
+( ) |
|
( )+ |
|
++[[ ]]++ |
||
| 620 110 130 100 70 100 ( 510 ) 120 110 140 80 80 ( 530 ) [[ 1040 ]] | ||
|
|
||