Mindy took a survey of her classmates to find out the type of movie that each student likes best. Mindy decides to expand her survey to another 80 students. Based on the survey, what number of students should Mindy expect to say that they prefer documentaries?

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