Question : The average mark of 60 students in a class is 62. The average marks of boys and girls in that subject are 60 and 65, respectively. The number of boys in the class is:
Option 1: 36
Option 2: 25
Option 3: 41
Option 4: 34
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Correct Answer: 36
Solution : Using the rule of alligation, we get, So, boys : girls = 3 : 2 Total students = 60 $\therefore$ Number of boys $=\frac{3}{3+2}×60=36$ Hence, the correct answer is 36.
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Question : The number of students in a class is 45, out of which $33 \frac{1}{3} \%$ are boys and the rest are girls. The average score of girls in Science is $66 \frac{2}{3} \%$ more than that of boys. If the average score of all the students is 78, then the average score of girls
Question : In a class of 60 students, there are 35 boys. The average weight of boys is 42 kg and the average weight of the full class is 46.5 kg. Find the average weight of girls in the class.
Question : The average mark obtained by a class of 60 students is 65. The average marks of half of the students were found to be 85. The average marks of the remaining students are:
Question : In a class of 60 students, 20 are girls. The average weight of the boys in the class is 40 kg, while that of all the girls is 35 kg. What is the average weight (in kg) of the entire class (correct to two decimal places)?
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