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25 5/8 - 11 5/6 = 13 19/24

Subtracting or adding fractions requires that they have the same denominator. You do this by finding the LCM and cross multiplying, including the numerators. The LCM of 8 and 6 is 24, so the problem becomes 25 15/24 - 11 20/24 = 13 19/24. Since 19 is prime, and 24 is not relatively prime to 19, the solution can not be reduced any further.

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Q: How much string remained if george used 11and 5 sixth m of his 25 and 5 eighth m of string?
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