George wants 42 liters of a mixture of water and 15% lemon juice. He has a mixture of 5% lemon juice and a mixture of 20% lemon juice. How many liters of the 5% and 20% mixtures should he mix to get what he wants? (Round you answer to the nearest tenth if necessary.)

52 i need  the points

what is the answer to this

the functions have the same rate of change i think. i narrowed it down to this answer and "the rate of change of tour 1 is greater" but i got it wrong using that answer so im assuming its the answer above. (this is a question i also answered from the iready site if anyone needs a reference)