Q. 14.6( 8 Votes )

The mean weight o

Answer :

Let the number of boys is ‘x' and the number of girls is (150 – x)


Mean weight of 150 students = 60 kg


Mean weight of ‘x’ boys = 70kg


Total weight of boys = 70x


Mean weight of (150 – x) girls = 55


Total weight of girls = (150 – x) × 55



Applying above formula,




70 x – 55 x + 150 × 55 = 150 × 60


15 x + 8250 = 9000


15 x = 750



x = 50


So, the number of boys 50 and number of girls 150 – 50 = 100


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses