|
609 Stamp |
Name : _________________ |
||
|
There are 220 stamps which are 4-cent stamps and 9-cent stamps. Altogether they cost 1430 cents. How many 4-cent stamps are there? |
There are 180 stamps which are 4-cent stamps and 8-cent stamps. Altogether they cost 1040 cents. How many 4-cent stamps are there? |
|
+( ) |
|
( )+ |
|
++[[ ]]++ |
||
| 609 110 80 100 140 90 ( 520 ) 100 110 150 150 140 ( 650 ) [[ 1170 ]] | ||
|
|
||