If there r 2 pipes . one pipe fills a tank in 32 min while another pipe empty filled tank in 16 min. . if tank is already half filled so in how many min. it will filled full if both pipes opened at same time ?
The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?
frank
Maths is your friend
If you meet with him every day, he becomes your best friend.
If you leave for a time he forget you and you forget him.