Mamun is twelfth from the left and Alam is fifteenth from the right in a row. If we interchange their positions, Alam becomes twentieth from right. How many boys are there in the row ?

The total population of 10 countries in the Asian zone is greater than the total population of 11 countries in...

If you had only one match stick and entered a COLD and DARK room, where there was an oil heater, an oil lamp a...

The positive difference between the squares of any two consecutive integers is always -

If x+y = z and x = y, then all of the following are true EXCEPT -

35% of Rashed's income is equal to 25% of Mithu's income. The ratio of their income is -

If the difference between two numbers is 7 and their product is 60, then one of the two numbers must be-