Math, asked by gilljasbir75, 1 month ago

The mean weight of 80 students in a class is 60 kg
The mean weight of boys is 70 kg while that of the
girls is 50 kg. the number of boys and girls
are​

Answers

Answered by ayushib327
0

Answer:

The mean weight of the boys from the class is 70 kg, while that of girls is 55 kg. What is the number of girls in the class? Now, mean weight of all boys from the class is 70 kg and mean weight of all girls from the class is 55 kg.

Answered by 04soumiya
0

Answer:

40,40

Step-by-step explanation:

Total students in class = 80

mean weight=60kg

total weight =80×60=4800kg

Let the total number of boys =x

mean weight of boys =70kg

total weight of boys = 70x kg

total number of girls = total students - no. of boys =80−x

mean weight of girls=50kg

total weight of girls =50×(80−x)

                                =50×80−50x

                                = (4000−50x) kg

Total weight = weight of boys + weight of girls

4800=70x+(4000−50x)

4800=70x+4000−50x

4800−4000=70x−50x

800=20x

800/20=x

40=x

So number of boys =40

number of girls =80−40=40

Answer is 40,40

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