Question

A mixture contains alcohol and water in the ratio 4:3. If 5 litres of water is added to the
mixture, the ratio becomes 4:5. The quantity of alcohol in the given mixture is
(A) 10 litres (B) 5 litres
(C) 7.5 litres (D) 2.5 litres
​

Answer 1

Answer:

2.5

Step-by-step explanation:

4x + 5. 4

---------- = ------

3x + 5 5

By cross multiplication we get,

5 (4x + 5) = 4 (3x + 5)

= 20x + 25 = 12x + 20

= 8x = -5

x = -5/8

Alcohol = 4x = 4 × -5/8

= -5/2

= 2.5 litres