If 5a = 3b=20, then 45ab =

How many times does the digits '4' come to write numbers from 10 to 100?

Which of the following is the lowest positive integer that is divisible by 8,9,10,11 , and 12?

If a and b are two different prime numbers , which of the following is the smallest possible value of a+b ?

3xy -20 +5x -12y =?

while working 7 hour a day , A alone can complete a piece of work in 6 days and B alone in 8 days . In what ti...

P and O invested in a business. The profit earned was divided in the ratio 2 :3 . If P invested TK. 40000, the...