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Mathematics for IGCSE & O level - Ratio And Proportion (Section 2 - No. 32)

A mixture is made by mixing cement, sand and gravel in the ratio 1:3:6. What percentage of the mixture is sand?
10%
30%
60%
15%

Vysvětlení

1+3+6 = 10, 3/10 = 30%

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