The LCM of 1.2 and 2.7 is:

Two pipes of length 1.5 m and 1.2 m are to be cut into equal pieces without leaving any extra length of pipes. The greatest length of the pipe pieces of same size which can be cut from these two lengths will be

Each side of an equilateral triangle is 6 cm. Find its area.

Which of the following numbers is not a prime number?

The LCM of four consecutive numbers is 60 The sum of the first two numbers is equal to the fourth number. What is the sum of four numbers? 

42 boys can complete a piece of work in 20 days working 8 hours per day. In how many days can 14 boys complete the same work, each boy working 12 hours per day?

What is the L.C. M of  $$ {2\over 5},{3\over 10},{4\over 15}$$.

Which of the following quadratic equations has real roots?