We can find the value of all the variables where $a = 2 b, c = 3 b$ if we know the value of .

only both a and b

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only a

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either a or b or c

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Solution

The correct option is C either a or b or c
If we know the value of either of the variables a, b, c, we can find the values of the remaining 2 variables by substituting the given value in the given equations.

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