56. Solving a chemistry problem

253. When determining furfural in a mixture by gas chromatography, the area of its peak Sfurfural was compared with the peak area of 0-xylene Sxylene, which was introduced as a standard. For a standard sample containing 25% furfural and the test sample, the following results were obtained:
Option Standard sample Test sample
Sfurfural, mm2 Sxylene, mm2 Sfurfural, mm2 Sxylene, mm2
253 27 40 28.2 41