Let U = {q, r,s, t,u, v,w, x,y, z}, A={q, s,u, w,y}, B={q, s,y, z}, and C={v, w,x, y,z}. List the elements in the set open parentheses A union B close parentheses to the power of apostrophe intersection C

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