To convert the decimal 5.875 into a fraction, we follow these steps:
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Break down the decimal: \[ 5.875 = 5 + 0.875 \]
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Convert 0.875 into a fraction:
- Recognize that \( 0.875 \) is equal to \( \frac{875}{1000} \) since there are three digits after the decimal.
- Now simplify \( \frac{875}{1000} \).
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Simplifying \( \frac{875}{1000} \):
- Both the numerator and the denominator can be divided by 125: \[ 875 \div 125 = 7 \ 1000 \div 125 = 8 \]
- Thus, \( \frac{875}{1000} = \frac{7}{8} \).
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Combine the integer part with the fraction: \[ 5 + \frac{7}{8} = \frac{5 \cdot 8 + 7}{8} = \frac{40 + 7}{8} = \frac{47}{8}. \]
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Final answer: The amount of wood Brigid needs, in simplified fraction form, is: \[ \boxed{\frac{47}{8}}. \]