ഒരു ക്ലാസ്സിലെ 30 കുട്ടികളുടെ ശരാശരി മാർക്ക് 40 ഉം ബാക്കി 20 കുട്ടികളുടെ ശരാശരി മാർക്ക് 35 ഉംആയാൽ ആ ക്ലാസ്സിലെ കുട്ടികളുടെ ശരാശരി മാർക്ക് എത്ര ?
A40
B35
C38
D37
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