the radiator in Johns car contains 16 L of antifreeze. How much of this mixture should be drained and replaced with pure antifreeze so there will be a mixture of 50% antifreeze.

Answer 1

better read what you posted . . .

Answer 2

This is word for word what my teacher wrote

Answer 3

if the radiator already contains pure antifreeze, how would adding more antifreeze change anything?

Answer 4

He purposely made a problem with not enough info.