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Question

A painter mixes colour paint with white colour so that the mixture contains 10% blue colour. In a mixture of 40 litres colour, how many litres of blue colour should be added so that the mixture contains 20% of blue colour?
 
  1. 5 litres
  2. 2.5 litres
  3. 2 litres
  4. None of these
  5. 4 litres


Solution

The correct option is A 5 litres
Quantity of blue paint in the mixture =10% of 40
=4 litres
Quantity of white paint in the mixture
=40-4 =36 litres
Let, x litres blue paint be added
According to the question, in the final mixture
Quantity of blue paintQuantity of white paint=4+x36=2080
4+x=20×3680x=94=5litres.
 

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