Q9. average marks in maths in a class of 40 students is 45. average of all the 30 boys is 50. then the average marks obtained by the girls is
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total student=40
Average markes of whole class=45
Average marks of boys=50
Average marks=sum of marks/total no.of student.
45=sum of all number/40
45×40 =sum of all numbers
1800= sum of all numbers
↪ average marks of girls= x
average marks of boy= x ÷ total number of boys
50 = x ÷ 30
50× 30= x
1500 = x
average marks of girls =1800-1500 =300
total girls =30-40=10
average marks of girls=300÷10=30
Average markes of whole class=45
Average marks of boys=50
Average marks=sum of marks/total no.of student.
45=sum of all number/40
45×40 =sum of all numbers
1800= sum of all numbers
↪ average marks of girls= x
average marks of boy= x ÷ total number of boys
50 = x ÷ 30
50× 30= x
1500 = x
average marks of girls =1800-1500 =300
total girls =30-40=10
average marks of girls=300÷10=30
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