A nurse is preparing to administer methotrexate 7.5 mg subcutaneous for a client who has rheumatoid arthritis. Available is methotrexate 15 mg/0.4 mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

To calculate the dosage of methotrexate for a client who has rheumatoid arthritis, the nurse needs to use the following formula: D/H x Q = X, where D is the desired dose, H is the dose on hand, Q is the quantity of the solution, and X is the amount to administer. In this case, D is 7.5 mg, H is 15 mg, and Q is 0.4 mL. Plugging these values into the formula, we get: 7.5/15 x 0.4 = 0.2. Therefore, the nurse should administer 0.2 mL of methotrexate subcutaneously for the client.