A online campus student answered 51 questions correctly out of 64 total questions on an assignment. Write the portion of the questions answered correctly as a decimal rounded to the nearest thousands. If you don't answer i will find you. And do something bad

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