There are 120 students in a class in which 20 of them are girls and rest are boys The - Maths - Statistics

Question

There are 120 students in a class in which 20 of them are girls
and rest are boys The average marks in mathematics of the boys is
65% and that of is 80%, find the average marks of the class

S. Usha Rani · Accepted Answer

Number of girls = 20
Number of boys =120-20=100
The average marks of boys =65%
total marks of boys number of boys = 65total marks of
boys100=65Total marks of boys = 6500 (1)
Average marks of girls =80%
total marks of girls number of girls=80total marks of
girls20=80Total marks of girls = 1600 (2)
From (1) and (2)
Total marks of class = 6500+1600=8100
Average =8100/120=67 5%

There are 120 students in a class in which 20 of them are girls and rest are boys. The average marks in mathematics of the boys is 65% and that of is 80%, find the average marks of the class