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7. Rachel rode her bike for one-fifth of a mile on Monday and two-fifths of a mile on Tuesday. How many miles did she ride altogether?

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Answer : 3/5 mile
Explanation: It asks for the total mileage, meaning we will add. Since 1/5 and 2/5 have the same denominator, all you have to do is add the numerators. 1+2=3, and thus 1/5+2/5=3/5
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