Question

In what proportion 50% and 90% alcohol be mixed to make 60% alcohol?​

Answer 1

Explanation:

Take 1 liter of 70% add 1 liter of 50% makes a total of 2 liters. In this 2 liter solution “swims” half of it 70% [35%] and half 50% [25%]. This makes 35% + 25% in total 60% solution.