ഒരു ക്ലാസ്സിലെ 30 കുട്ടികളുടെ ശരാശരി മാർക്ക് 40 ഉം ബാക്കി 20 കുട്ടികളുടെ ശരാശരി 35 ഉം ആയാൽ ആ ക്ലാസ്സിലെ ആകെ കുട്ടികളുടെ ശരാശരി മാർക്ക് എത്ര?
A37
B38
C40
D36
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