1. En un zoológico de 40km2 de superficie se encuentran distribuidos 320 animales de diferentes especies ¿Cuál es la densidad poblacional? Datos Fórmula Solución

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