Sonya

Sonya, Jill, and Donna run each Monday. Jill ran 6/12 of an hour, and Donna ran 5/12 of an hour. If the girls ran a total of one whole hour, what fraction of an hour did Sonya run?

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You need to know the following knowledge to solve this word math problem:

arithmetic

addition
subtraction

planimetry

area of a shape

numbers

fractions

Units of physical quantities

time

Grade of the word problem

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