Jacob ate pie for dessert. He says the amount he ate is equal to the product One-fifth times one-half. Which model represents how much of the whole pie Jacob ate? pls help

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