\begin{tabular}{l} Calculate \( x \) for each ratio \\ \( \qquad 21=x: 7 \) \\ \hline (B) \( 15: 25=32 \)\end{tabular}
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To solve the equation \( 21 = x:7 \), we can rewrite it in a more familiar form. A ratio can be expressed as a fraction, so we can write it as \( \frac{x}{7} = 21 \). To find \( x \), we can cross-multiply: \( x = 21 \times 7 \). This gives us \( x = 147 \). For the second ratio \( 15:25 = 32 \), we need to set up a proportion. We can rewrite it as \( \frac{15}{25} = \frac{32}{y} \). By cross-multiplying, we get \( 15y = 25 \times 32 \). Solving for \( y \) gives us \( y = \frac{800}{15} \), which reduces to \( y \approx 53.33 \). So, the answers are \( x = 147 \) and \( y \approx 53.33 \).