以下是30道解比例计算题及答案，涵盖比号式、分数式、混合式和复杂比例方程类型：
一、比号式（10道）
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$x:3/5 = 70:6$
解：$6x = 3/5 \times 70$，$x = 7$
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$0.375:x = 1/20:60%$
解：$0.375 \times 60% = x \times 1/20$，$x = 13.5$
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$1.5:8 = 0.5:x$
解：$1.5x = 8 \times 0.5$，$x = \frac{8}{3}$
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$1.25:0.25 = x:16$
解：$0.25x = 1.25 \times 16$，$x = 80$
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$2:3 = 4:x$
解：$2x = 3 \times 4$，$x = 6$
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$5:8 = x:16$
解：$8x = 5 \times 16$，$x = 10$
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$3:4 = 9:x$
解：$3x = 4 \times 9$，$x = 12$
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$7:9 = x:27$
解：$9x = 7 \times 27$，$x = 21$
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$10:15 = x:30$
解：$15x = 10 \times 30$，$x = 20$
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$4:5 = x:25$
解：$5x = 4 \times 25$，$x = 20$
二、分数式（10道）
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$\frac{25}{20} = \frac{x}{28}$
解：$20x = 25 \times 28$，$x = 35$
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$\frac{1.25}{x} = \frac{5}{6}$
解：$5x = 1.25 \times 6$，$x = 1.5$
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$\frac{6}{7.5} = \frac{0.16}{x}$
解：$6x = 7.5 \times 0.16$，$x = 2$
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$\frac{3.6}{4.8} = \frac{4}{x}$
解：$3.6x = 4.8 \times 4$，$x = \frac{40}{3}$
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$\frac{1}{2} = \frac{x}{4}$
解：$2x = 4$，$x = 2$
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$\frac{3}{4} = \frac{9}{x}$
解：$3x = 4 \times 9$，$x = 12$
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$\frac{5}{8} = \frac{x}{16}$
解：$8x = 5 \times 16$，$x = 10$
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$\frac{7}{9} = \frac{x}{27}$
解：$9x = 7 \times 27$，$x = 21$
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$\frac{2}{3} = \frac{x}{15}$
解：$3x = 2 \times 15$，$x = 10$
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$\frac{4}{5} = \frac{x}{20}$
解：$5x = 4 \times 20$，$x = 16$
三、混合式（5道）
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$7:8 = \frac{35}{x}$
解：$7x = 8 \times 35$，$x = 40$
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$0.5:x = \frac{0.6}{2.4}$
解：$0.5 \times 2.4 = x \times 0.6$，$x = 2$
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