In one litre of a mixture of alcohol and water, water is 30%. The amount of alcohol that must be added to the mixture so that the part of water in the mixture becomes 15% is :
Options:
A . 900 ml
B . 1000 ml
C . 700 ml
D . 300 ml
Answer: Option B Answer: (b)In 1 litre i.e. 1000 ml of mixture,Alcohol = 700 ml. Water = 300 ml.Let x ml of alcohol is mixed. $300/{1000 + x} ×100 = 15$1000 + x = 2000 ⇒ x = 1000 ml.
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