Question

How many litres of 50% alcohol solution should be added to 60 litres of a 30%
alcohol solution to prepare a 60% solution?​

Answer 1

Answer:

80 litres

Step-by-step explanation:

Let quantity of 20% alcohol solution be added

: x liters

Eqn for altered solution ....

> x*20% + 40 * 50% = (x+40) * 30%

> x*0.2 + 40*0.5 = (x+40)*0.3 ..(converting  percentages into decimal)

> 0.2x + 20 = 0.3x + 12

> 20-12 = 0.3x - 0.2x (Rearranging similar

terms)

> 8 = 0.1 x

Hence x = 8/0.1

Ans 80 Litres