Simplify: 10 divided by 1/4
1) 40
2) 1/40
3) 2 and 1/2
4) 20

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