To determine which fractions are equivalent to the fraction \( \frac{35}{1} \), we can simplify each of the given fractions and see if they equal to \( 35 \).
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\( \frac{30}{50} \): \[ \frac{30}{50} = \frac{30 \div 10}{50 \div 10} = \frac{3}{5} \]
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\( \frac{12}{15} \): \[ \frac{12}{15} = \frac{12 \div 3}{15 \div 3} = \frac{4}{5} \]
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\( \frac{12}{20} \): \[ \frac{12}{20} = \frac{12 \div 4}{20 \div 4} = \frac{3}{5} \]
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\( \frac{8}{10} \): \[ \frac{8}{10} = \frac{8 \div 2}{10 \div 2} = \frac{4}{5} \]
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\( \frac{21}{35} \): \[ \frac{21}{35} = \frac{21 \div 7}{35 \div 7} = \frac{3}{5} \]
Upon checking these, we see that none of the fractions equal 35. All the fractions simplify to different values. Only \( \frac{21}{35} \) simplifies to a lesser fraction but has a relation to 35.
Now, if the question asks for fractions that, when set against a common factor with 35, stand out:
- \( \frac{21}{35} \) is equivalent to \( 35/1 \) because both equal to the number 1 when expressed as a full number.
None of the other listed fractions hold equivalence. If we consider misunderstanding in terms of discussing joint factors, we don't directly find equivalences here.
If the question is looking for fractions of 35, then we can clarify or correct on the understanding since none of the fractions provided equate to 35 in the sense of being multiples or equivalents decisively except \( 21/35 \) in the context of unity towards a whole.
Please let me know if you want further clarification or a different computation!