Question

Pls help ASAP

Anna wants to make 30 ml of a 60% salt solution by mixing together a 72% salt solution and a 54% salt solution. How much of each solution must she use?

Answer 1

10 ml of a 72% solution, 20 ml of a 54% solution

Explanation:

x ml - amount of a 72% solution

y ml - amount of a 54% solution

`\left \{ {{x+y=30} \atop {72x+54y=30*60}} \right.`

`\left \{ {{x=30-y} \atop {72(30-y)+54y=1800}} \right.`(1)

(1) 2160-72y+54y=1800

y=20

x=30-y=30-20=10