Naplex practice question (level difficulty: hard) - mixing two different percentage strengths

A hospital pharmacist receives a prescription for 3% saline for a patient in the Neuro ICU. The premixed 3% saline bags that the pharmacy normally stocks are on backorder. How many milliequivalents of 23.4% NaCl will need to be added to a 1 liter bag of normal saline to prepare 3% saline for this patient? (MW of Na = 23; MW of Cl = 35.5). (Answer must be numeric; no units or commas; round final answer to the nearest TENTH.)