Paul mixed 5 quarts of dry ingredients and 2 quarts of water to make a batch of concrete. he ran out of the mixture before finishing his project, so he made another batch using 15 quarts of dry ingredients

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