6. There are 20 boys and 20 girls in a class. The average percentage marks of the students in the class are more than 70, but less than 85 for a particular monthly test. The average percentage marks scored by the boys is more than 60, but less than 75. What is the range of the average percentage marks scored by the girls?
A. 65≤y≤110
B. 140≤y≤170
C. 60≤y≤75
D. 75≤y≤110

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C.

there are as many boys as girls so the percentage should be the same as the boys

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