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A can do a piece of work in 20 days and B can do it in 30 days. How long will they take to do the work together?

The breadth of a rectangular field is 60% of its length. If the perimeter of the field is 800 m, what is the area of the field?

Select the number from the given options which will come in place of the question mark (?) in the following series. 

6, 12, 14, 28, 30, 60, ?

Find the G.C.D. of the following:

35x⁵ y³ z⁴, 49x² yz³, 14xy² z²

Find the LCM of pair of the following polynomials x⁴ – 27a³ x, (x-3a)², whose GCD is (x-3a)

The curved surface area of a right circular cone of height 15 cm and base diameter 16 cm is

The highest number which divides the product of any three consecutive even natural number is

10 lakh candidates write the TNPSC Exam this year. If each exam centre is allotted with 1000 candidates. How many exam centres would be needed?

If a/b = 3/5, b/c = 4/7 then a:b:c is