The average (mean) of 90 numbers is 60, and the average of 60 numbers is 90. What is the average of all the numbers?
1 answer:
Answer: 72
Step-by-step explanation:
Total score of 90 nos. 90 x 60 = 5400
Total score of 60 nos. 60 x 90 = 5400
Total score of 150 nos
= 10800 / 150 = 72
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