Book Maths Puzzle Numerical Ability

4. Aisi wrote the first few natural numbers in her book but happened to miss out one of the numbers. She later calculated the sum of all the numbers that she wrote and divided it by what she thought was the number of the numbers she had written. If the result she thus obtained was 480/11. find the number that she forgot to write.

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Book Other Question

A watch which gains 5 sec. in 3 min. was set right at 7 a.m. In the afternoon of the same day , when the watch indicated quarter past 4 o'clock , the true time is : 3. Mr X invested a certain amount for 15 years in a term deposit scheme. An interest of INR 1250 was accrued for the 5th year whereas INR 5000 was accrued for the 11th year. If the interest is compounded annually, then what would be the maturity value of a sum of 10,000 invested today, at the end of 15 years?