Question

the average marks of girls in a class is 70.the average marks of 5 girls among them is 75.the average marks of remaining girls is 67.5,then what is the number of girls in the class
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Answer 1

Answer:

15

Step-by-step explanation:

totalmarks/noofgirls=70

marks/5=75

marks=375

total-375/noofgirls-5=67.5

total=375+67.5(noofgirls)-67.5(5)

noofgirls=15