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A milkman wants to empty a large drum fill of milk with one of the four measuring jars of capacities 6, 9, 15 and 18 litres, respectively. He finds that no matter which jar he uses to empty the drum, 4 litres of milk remains to be emptied. What is the least possible volume of the drum if it is a multiple of 7?

[IB ACIO Grade II Previous Paper 5 (Held on: 19 Feb 2021 Shift 1)]
A
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D

EXPLANATION

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