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The average age of 15 students in a classroom is 20 years. When two new students, Raj and Simran, join the class, their ages being in the ratio of 7:8, the overall average age increases by 3 years. What is the age difference between Raj and Simran?

A 4 yrs

B 6 yrs

C 12 yrs

D 10 yrs

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