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1. a man is on a 4 days trip. he had decided to keep his average expense for 4 days at Rs 80. However, at the end of third day he realized that his expenses on first three days were Rs 80, Rs 90, Rs 110 and respectively. How much should he spend on 4th day to ensure that he meets his targeted average expense?
2. find the average of all composite numbers from 1 to 25.
3. How much will be the average of the squares of natural numbers from 1 to 20?
4. The average of first 19 multiples of 12 is
5. find the average of pi and first 5 numbers ending with 0.
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