Ababy weighed 7.25 at birth. at the end of 8 month, the baby weighed 2 1/2 times its birth weight. how many pounds did the baby weigh at the end of 8 months

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