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What number should replace the question mark? 12 40 71 51 56 --- -- --- -- ---------- 90 44 22 33 ? *if you're confused, 12 is above 90. 40 is above 44. 71 is above 22. 51 is above 33. and 56 is above the question mark. Please provide an answer AND explanation.

When Avril organised a picnic, she brought along melons she thought would be thirst-quenching. They got through half of them, plus half a melon, and were left with one whole melon. How many had Avril provided for the picnic to start with? Please provide answer AND explanation.