11 14 Joan makes oups of tea and coffee at a lunch club
Each oup requires 250 ml of boiling water
She has a kettle that bolle up to 1.7 litres of water each time.
She boils 10 litres of water in an um
She then uses the kettle to boil the rest of the water she needs.
Find the least number of times that Joan needs to boil the kettle to make 56 cups
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