Quantitative Aptitude - Arithmetic Ability Questions

The smallest number that must be subtracted from 2800 so that the obtained number is a perfect square is

If after giving a discount of 18%, a book is sold for Rs 1599, then what will be the marked price (in Rs) of the book?

The ratio of the present ages of Reena and her husband is 4 : 5. 8 years from now, ages of her husband and her son will be in the ratio 24 : 9. If the present age of Reena is 32 years, then what will be her son’s present age (in years)?

The average revenues of 13 consecutive years of a company is Rs 78 lakhs. If the average of first 7 years is Rs 73 lakhs and that of last 7 years is Rs 85 lakhs, what is the revenue for the 7th year?

Alipta got some amount of money from her father. In how many years will the ratio of the money and the interest obtained from it be 10:3 at 6% simple interest per annum?

What is the ratio of simple interest earned on certain amount at the rate of 12% for 6 years and that for 12 years?

A can do a piece of work in 8 days and B can do it in 10 days seperately. How many days would it take for both A and B to finish the same work together?

What is the value of (4/3) cot2 (p/6) + 3 cos2 (150) – 4 cosec2 45 + 8 sin (p/2)?