algebra
posted by Katie .
Tammy bought 16 cookies for a
party. She had 6 cookies decorated at an extra
cost of 25 cents each. If the total cost of the
cookies was $9.50, how much did each plain
cookie cost?

6 * 0.25 = $1.50
$9.50  1.50 = $8.00
8/16 = 0.50
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I don't know how to make an equation for this?