'A' can do a piece of work in 6 days and 'B' can do in 4 days. How long will they take if both work together? 

The L.C.M. of two numbers is 2079 and their H.C.F. is 27. If one of the number is 189, find the other: 

The perimeter of a square is 40 cm. Find the area: 

Find the odd one in the group: 27, 35, 47, 52, 63

The sum of ages of Sita and Reena is 32. Age of Reena is 3 times the age of Sita. Age of Reena is: 

Simplify