Question

Pls help ASAP

Answer 1

Answer:

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

Step-by-step 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