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Bah, (a) came to me in seconds, had to have some dinner and a smoke to nut-out Q3 (b) haha
Fill the 10L jug and tip it into 7L jug untill full.
3L remains in the 10L jug.
Empty the 7L jug back into the vat.
Transfer the 3L that remains in the 10L jug into the 7L jug.
Fill the 10L jug again, tip it onto the 3L in the 7L jug untill full.
6L remains in the 10L jug.
Empty the 7L jug into the vat again.
Transfer the 6L that remains in the 10L jug into the 7L jug.
Fill the 10L jug yet again, tip onto the 6L in the 7L jug untill full .
9L remains in the 10L jug.
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