Is a persons weight a function of their height why

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

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?