Find cost of the dress

Question

3 pairs of jeans, 5 dresses and 6 shirts cost $888. 1 pair of jeans and 1 dress cost $128. Each dress cost $20 more than each shirt. How much does each dress cost?

Answer 1

Let j = cost of a pair of jeans, d = cost of a dress, s = cost of a shirt.

 

3j + 5d + 6s = $888

j + d = $128   (so d = 128 - j)

d = s + $20    (since d = 128 - j, then 128-j = s + 20 so 108 - j = s)

 

3j + 5d + 6s = $888

3j + 5(128-j) + 6(108-j) = 888

3j + 640 - 5j + 648 - 6j = 888

 

Solve for j.  Once you have j, d = $128 - j.