blending liquids

Question

If I blend equal parts 99% alcohol and 50% alcohol, what will be the percentage of the resulting alcohol?

Answer 1

We will need to make up some amounts of the alcohol. I will suggest we say they are each 50 g so the total will be 100 g.

The formula is

(percent)(amount) + (percent)(amount) = (percent)(total amount)

(.99)(50) + (.50)(50) = (x/100)(100)

49.5 + 25 = x (because the 100s cancelled out)

74.5% is the answer