SOLUTION: A MIXTURE OF 40 LITRES CONTAINS 10% WATER AND 90% MILK. HOW MANY LITRES OF WATER IS TO BE ADDED TO MAKE THE WATER CONTENT 20%

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Question 762122: A MIXTURE OF 40 LITRES CONTAINS 10% WATER AND 90% MILK. HOW MANY LITRES OF WATER IS TO BE ADDED TO MAKE THE WATER CONTENT 20%
Answer by lwsshak3(11628) About Me  (Show Source):
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A MIXTURE OF 40 LITRES CONTAINS 10% WATER AND 90% MILK. HOW MANY LITRES OF WATER IS TO BE ADDED TO MAKE THE WATER CONTENT 20%
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let x=amount of water to add.
10%*40=4 litres=amount of water in original mixture
4+x=amount of water in new mixture
40+x=amount of new mixture
4+x=20%(40+x)
4+x=8+0.2x
0.8x=4
x=5
amount of water to add=5 litres