The mean weight of 180 students in a school is 50 kg. The mean weight of boys is 60 kg and that of girls is 45 kg. Find the number of boys and girls.
Answers
Answered by
16
SOLUTION:
Total student's in class =180
Mean weight=50kg
Total weight=180×50=9000kg.
Let the total no. of boys=x
Mean weight of boys=70x kg
Total no. of girls=Total student-Number of boys=180-x
Mean weight of girls=45kg
Total weight of girls=45×(180-x)=8100-45x kg
Total weight= weight of boys+weight of girls
9000=70x+(8100-45x)
9000=70x+8100-45x
9000-8100=70x-45x
900=25x
x=900÷25
x=36
Now, No. of boys= 36
Number of girls=180-36=144 ANS...
Answered by
5
Answer:no of boys = 60
No of girls = 120
Step-by-step explanation:
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