A mixture of methane and ethylene in the volume ratio \( \mathrm{a}: \mathrm{b} \) has a total v...

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A mixture of methane and ethylene in the volume ratio \( \mathrm{a}: \mathrm{b} \) has a total volume of \( 30 \mathrm{~mL} \). On complete combustion it gave \( 40 \mathrm{~mL} \) of \( \mathrm{CO}_{2} \). If the ratio had been \( \mathrm{b}: \mathrm{a} \), instead of \( a \) : \( b \), what volume of \( \mathrm{CO}_{2} \) would have been obtained?
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