A school has three classrooms for grade 12, namely 12A, 12B and 12C. The number of students in these class-
rooms is 28, 20 and 22 respectively. All the students took an examination and the average score of the sts of
12A, 128 and 12C is 60, 70 and 70 respectively. What is the average score in this examination for all students:
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Step-by-step explanation:
80 is the average score in this exam for all students.
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