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12-08-2015
Mathematics

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There are 21 liters of milk in 2 bottles, bottle A and bottle B. If bottle A contains 3 more liters of milk than Bottle B, How much milk is there in bottle B?

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13-08-2015

a+b=21
a=3+b
subsitute
3+b+b=21
subtract 3
b+b=18
2b=18
divide 2
b=9

there are 9 liters in b

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