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Rhonda has 12 marbles more than Douglas. Douglas has 6 marbles more than Bertha. Rhonda has twice as many marbles as Bertha has. How many marbles does Douglas have?

Rhonda has 12 marbles more than Douglas. Douglas has 6 marbles more than Bertha. Rhonda has twice as many marbles as Bertha has. How many marbles does Douglas have?

Input interpretation:

Rhonda has 12 more marbles than Douglas has.

Douglas has 6 more marbles than Bertha has.

Rhonda has 2 times the number of marbles as Bertha has.

How many marbles does Douglas have?

Result:

Douglas has 24 marbles.

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