Answer:
2 biographies, 3 action, 3 mysteries - (10x2) + (5x3) + (5x3) = 50
Step-by-step explanation:
She wants to buy two of each book so make that your base and figure out how much is left over and purchase another 1 or more books to make up that difference. She could also purchase 3 biographies, 2 action and 2 mysteries to spend $50.00.