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40 litres of 60% concentration of acid s...

40 litres of 60% concentration of acid solution is added to 35 litres of 80% concentration of acid solution. What is the concentration of acid in the new solution ?

A

0.69

B

0.66

C

`69 1/3` %

D

`66 2/3` %

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The correct Answer is:
C
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