Ed decides to include more fruit in his diet. he goes to the grocery store over the weekend and buys 6 apples, 6 oranges, and 6 avocados. the total cost is $19.50.

ed finishes the apples very quickly, and has some leftover avocado. the following weekend he buys 12 apples, 2 oranges, and 1 avocado. this time he pays just $9.50.

the following week, ed reads an article on the benefits of avocado, so over the weekend he buys 5 avocados along with 2 apples and 4 oranges. his total this time is $14.

assume that ed pays a unit price rather than a price per pound for the apples, oranges, and avocados.

write the three equations that give the total amount ed paid each week for fruit.