|
730 Stamp |
Name : _________________ |
||
|
There are 220 stamps which are 6-cent stamps and 5-cent stamps. Altogether they cost 1220 cents. How many 6-cent stamps are there? |
There are 120 stamps which are 6-cent stamps and 8-cent stamps. Altogether they cost 820 cents. How many 6-cent stamps are there? |
|
+( ) |
|
( )+ |
|
++[[ ]]++ |
||
| 730 120 150 110 150 110 ( 640 ) 70 130 100 100 130 ( 530 ) [[ 1170 ]] | ||
|
|
||