1.

In what ratio must a mixture of 15% spirit strength be mixed with that of 25% spirit strength to get a mixture of 21% spirit strength? 1). 1 : 32). 2 : 3 3). 3 : 4 4). 4 : 5

Answer»

Solution: 

Let the RATIO of the MIXING be x:y 

15% of x and 25% of y MUST be mixed to give 21% of (x+y).

(15x/100) + (25y/100) = (21/100)(x + y) 

(15x + 25y)/100 = 21(x +y)/100 

15x + 25y = 21x + 21y

21x - 15x = 25y - 21y 

6x = 4y

x/y = 4/6

x : y = 2 : 3 

So, the correct OPTION is 2). 2:3 



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