Answer:
Row 5: Number of Coins or Bills = X = 2
Row 6: Number of Coins or Bills = y = 3
Row 7: Number of Coins or Bills = Z = 5
Row 8: Number of Coins or Bills = x + 7 = 2 + 7 = 9
Row 9: Number of Coins or Bills = 20 - Z = 20 - 5 = 15
Row 10: Number of Coins or Bills = 9x = 9 * 2 = 18
Row 11: Number of Coins or Bills = 4y = 4 * 3 = 12
Row 12: Number of Coins or Bills = 97z = 97 * 5 = 485