Christopher is 20 years younger than ishaan. they first met two years ago. fourteen years ago, ishaan was 3 times as old as chris. how old is chris now

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