In a class of 40 students 60 are girls The average of the girls rsquo marks is 72 and that of the bo...........

Quantitative Aptitude (CGL) Percentage

In a class of 40 students, 60% are girls. The average of the girls’ marks is 72 and that of the boys is 54. What are the average marks of the whole class?

This questions was previously asked in

SSC CGL 12 June 2019 Shift-3

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64.8

65.4

65.2

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Explanation:

ratio of girls and boys = 60% : 40% = 3 : 2
Let the total number of girls and boys in the school is 3x and 2x respectively.
Total marks of the girls = avg marks total girls= 72 × 3x
Total marks of the Boys =54 × 2x
Avg marks of the school = $_{3x+2x}^{72\times 3x+54\times 2x}$ = 64.8