Q. Find the average of first 30 multiples of 5.
Answer: 75.5
Notes: The average of first 30 multiples of 5 : $latex 5\times \frac{(1+2+3+.....+30)}{30} = \frac{50\times 30\times 31}{30\times 2} = 76.5&s=1$ Option (b) is the right answer.

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