For what value of 'K' will the pair of equations 3x+4y=12 and kx+12=30 does not have a unique solution ?

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A mixture contains 2/5 of element A and 3/5 of element B. When 5ml of A is added to the mixture, the proportion of B in the mixture changes to 1/5. What amount of A was originally present in the mixture before the addition was made ?

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