Another tutor gave me the answer 0.5, which is what I also got, but it keeps getting graded incorrect. Can someone help me figure this out?

Question 6 0 out of 10 NDC 0009-5136-01 Pc only See package insert for dosage and complete product information. Warning: Not for injection. Store at 25*C (77*F) (see insert) Cently invert the bottle 3 to 5 times before using. DO NOT SHAKE. Keep container ZYVOX TM tightly closed. Protect from light and moisture. Constituted product may be used for 21 days. Store constituted suspension at room temperature. Discard linezolid for unused portion after 21 days oral suspension Mixing Directions: Gently tap bottle to loosen powder. Add a total of 123 ml distilled water in two portions. After adding the first half, shake vigorously to wet all of the powder. Then add the second half of the water and shake vigorously to obtain a uniform suspension 100 mg /5 ml Each 5 ml of suspension contains 100 mg linezolid U.S. Patent No. 5,688,792 Pharmacia & Upjohn Company $ 818070002 A subsidiary of Pharmacia LOT 150 ml Corporation Kalamazoo, MI EXP SL (when constituted) PHARMACIA 49001, USA Order: 50 mg How many teaspoons would you administer? Type in the number in the simplest form, no unit