The masses of two similar objects are 24kg and 81 kg respectfully. If the surface area of the larger one is 540cm2, find the surface area of the smaller one.

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