Who served as the Prime Minister of Bangladesh from 12 Jam, 1972 to 25 January 1975?
A positive number, when decreased by 4, is equal to 21 times the reciprocal of the number. The number is:
At present, the ratio between the ages Karim and Rahim is 4 : 3. After 6 years, Karim's age will be 26 years. What is the age of Rahim at present?
49 × 49 × 49 × 49=7 ?
The smallest number added to 680621 to make the sum a perfect square is:
The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?