one lady finger and six cookies cost $3.05. At the same prices, two lady fingers and four cookies cost $2.50. How much does one cookie cost?

Let F be the cost of one lady finger

Let C be the cost of on cookie.

so,

F + 6C = 3.05 eq. 1

2F + 4C = 2.50 eq. 2

use eq. 1 to solve for F:

F = 3.05 - 6C eq. 3

subsitute eq. 3 to eq. 2

2(3.05 - 6C) + 4C = 2.50

6.10 - 12C + 4C = 2.50

6.10 - 8C = 2.50

6.10 - 2.50 = 8C

3.60 = 8C

so C = $.45

so, each cookie costs

**45ยข**