Determinati nr nat a b si c stiind ca a+b +c+d=20. a: b=0. c+d=1. d: =2

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