If the square root of 841 is 29, then square root of 0.00000841 is equal to:

The digit in unit’s place of the product 81 × 82 × 83 × ... × 89 is

If x²+4y²=17 and xy=2, where x>0,y>0, then what is the value of x³+8y³?

The sum of three numbers is 252. If the first number is thrice the second and third number is two-third of the first, then the second number is

A certain number of men can do a work in 60 days. If there were eight more men, it could be completed in 10 days less. How many men were there in the beginning?

The sum of the present ages of a father and son is 52 years. Four years hence, the son's age will be $${1\over 4}$$that of the father. What will be the ratio of the ages of the son and father, 10 years from now?

If (x + 6y) = 8, and xy = 2, where x > O, what is the value of (x³+216y³)?

Which of the following options is divisible by 11?