if average of 100 students result marks is 70. Among them 60 girls' average marks is 75, what is the boys' average marks? the ans is 62.5 How you calculate it?
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Total marks of students = 100×70 = 7000
Marks obtained by girls = 60 × 75 = 4500
then, Marks obtained by Boys = 7000 - 4500
= 2500
Number of boys = 100 - 60 = 40
so, Average marks obtained by Boys =
2500÷ 40 = 62.5
Marks obtained by girls = 60 × 75 = 4500
then, Marks obtained by Boys = 7000 - 4500
= 2500
Number of boys = 100 - 60 = 40
so, Average marks obtained by Boys =
2500÷ 40 = 62.5
far00391:
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