Discussion
If three-sevenths of a number is 42, then five-sevenths of the same number is:
Answer: C
\[ \frac{3}{7}x = 42 \quad\Longrightarrow\quad x = 98 \]
\[ \frac{5}{7} \times 98 = 70 \]
Or directly: five sevenths is \( \tfrac{5}{3} \) of three sevenths, and \( 42 \times \tfrac{5}{3} = 70 \).
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