math
posted by luke .
in a series of stamps annie must buy six of each
one cost $4.00
one cost $2.50
one cost $1.20
one cost $1.00
she had to post a parcel and totals cost of postage was $25.70.what stamps can she use from the selection to make up this amount using
a)as many $4.00 stamps as possible
b)all her $1.00 stamps
c)what is the largest # that she can use from her collection to post the parcel
d)list the stamps she can use

I'll get you started.
To get the $0.70, she'll need to use one $2.50 stamp and one $1.20 stamp in each situation.
$25.70  $3.70 = $22.00
a) five $4.00 stamps + two $1.00 stamps + one $2.50 stamps + one $1.20 stamps
b) six $1.00 stamps + one $2.50 stamps + one $1.20 stamps + ???
We'll be glad to check your answers. 
in a series of stamps annie must buy six of each
one cost $4.00
one cost $2.50
one cost $1.20
one cost $1.00
she had to post a parcel and totals cost of postage was $25.70.what stamps can she use from the selection to make up this amount using
a)as many $4.00 stamps as possible
b)all her $1.00 stamps
c)what is the largest # that she can use from her collection to post the parcel
d)list the stamps she can use
Must use all the $1.00 stamps.
Therefore 25.70  6.00 = 19.70
The maximum number of $4.00 stamps now useable is 4.
Therefore, 19.70  16 = $3.70
Using 1 $1.20 and 1 $2.50 makes $3.70.
Therefore:
6 + 1.20 + 2.50 + 16 = $25.70
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