A fisherman needs to winterize his boat and uses a 40% antifreeze solution. How much pure antifreeze must he add to 10 liters of 25% antifreeze to make a 40% solution? Hint: pure
antifreeze is 100% antifreeze.

Cpr, or cardiopulmonary resuscitation, is a first-aid technique to save lives. it involves compressions of the patient's chest cavity. which description is the best description of the functions of chest compressions in cpr? chest compressions are done to pump the heart. chest compressions are done to strengthen the rib bones. chest compressions increase carbon dioxide inhalation. chest compressions allow the patient's muscles to wake up.