In a class, there are 18 very tall boys. If these constitute three fourths of the boys and the total number of boys is two-thirds of the total number of Students in the class, what is the number of girls in the class ?
A6
B12
C18
D21
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ഒരു ക്ലാസ്സിലെ 30 കുട്ടികളുടെ ശരാശരി ഉയരം 105 സെ.മീ. ആണ്. ശരാശരി ഉയരം 112 സെ.മീ.
ഉള്ള 20 കുട്ടികൾ കൂടി ആ ക്ലാസ്സിൽ ചേർന്നാൽ ശരാശരി ഉയരം എന്ത് ?