How many milliliters of a 12% alcohol solution and how many milliliters of a 30% alcohol solution must be mixed to obtain 72 ml of a 20% alcohol solution?

Target concentration = 20%.

Ratio of 12% and 30% alcohols needed

30-20 : 20-12 = 10:8 = 5:4

Volume of 12% = 72 mL * (5/(5+4)) = 40 mL

Volume of 30% = 72 mL *(4/(5+4)) = 32 mL

Total = 40+32 = 72 mL of 20%

i understand 100% 10/10 hit or miss?

step-by-step explanation:

80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

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