Question

47. A coaching institute has students in 3 batches - X,
Y and Z. In a certain examination, the average
marks obtained by these batches are 72, 60 and 50
respectively. The average marks of batches X and
Y taken together is 69. If the ratio of the number
of students in batches Y and Z is 6:7, what is the
average score of all the three batches put together?​

Answer 1

Answer:

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