Can someone explain how to get each answer for number 9 This is to study for a test. The test is tmrw! :(

Ineed asap.i cant understand this question i need someone to me right away

Someone me i need with this stuff

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