Aset of measuring cups has measures of 1 cup, 3/4 cup, 1/2 cup, 1/3 cup, and 1/4 cup. how could i measure 1/6 of a cup using these measuring cups?

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of