The mean weight of 180 students in a school is 50 kg. The mean weight – InterviewSolution

1.	The mean weight of 180 students in a school is 50 kg. The mean weight of boys is 60 kg andthat of girls is 45 kg. Find the number of boys and girls.
Answer» suppose x boys and y girlsso x+y=18060x+45y=180×504x+3y=12×50=6004x+3y-3x-3y=600-540so y=60so x=120so 120 boys and 60 girls

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