An animal health technician is stocking flea control products. He stocks three cases of spray containing 24 cans per case, 13 cases of shampoo with 12 bottles per case, 5 boxes of foam with 10 cans per case, and 6 cases of powder with 8 boxes per case. Three days later he calculates that 35 cans of spray, 18 bottles of shampoo, 5 cans of foam and 21 bottles of powder have been sold. How many total items of flea killing preparations are left in the cabinet?

• A. 245 preparations
• B. 251 preparations
• C. 247 preparations
• D. 249 preparations

Answer: (C)

Start with the amount stocked for each product and then subtract what has been sold. Spray: 3 cases × 24 cans = 72 cans. Shampoo: 13 cases × 12 bottles = 156 bottles. Foam: 5 boxes × 10 cans = 50 cans. Powder: 6 cases × 8 boxes = 48 boxes. Total stocked = 72 + 156 + 50 + 48 = 326 items.

Sold: 35 spray cans + 18 shampoo bottles + 5 foam cans + 21 powder boxes = 79 items sold. Remaining = 326 − 79 = 247 items.

Therefore, 247 flea-killing preparations are left.