Answer:
simple answer
Explanation:
Let x be the cost of one apple, y the cost of one orange, and z the cost of one avocado.
The first weekend, Ed buys 6 of each fruit and pays $19.50: 6x+6y+6z=19.5
The second weekend, Ed buys 12 apples, 2 oranges, and 1 avocado and pays $9.50: 12x+2y+z=9.5
The third weekend, Ed buys 2 apples, 4 oranges, and 5 avocados and pays $14: 2x+4y+5z=14.