HELPPPP!!!!!!!!!!!

Question

A container has 3 kg of phosphorus which is 81% strong. It is made from two mixes of 75% and 90% strength. How much of each mix is there?

Answer 1

1.8 kilograms of 75% solution mixed with

1.2 kilograms of 90% solution create

3 kilograms of 81% solution

1.8(.75) + 1.2(.90) = 3(.81)

1.35 + 1.08 = 2.43

2.43 = 2.43

Answer 2

1.8 kilograms of 75% solution mixed with

1.2 kilograms of 90% solution create

3 kilograms of 81% solution

1.8(.75) + 1.2(.90) = 3(.81)

1.35 + 1.08 = 2.43

2.43 = 2.43