The angle of elevation of the top of a tower from the point P and Q at distance of 'a' and 'b' respectively from the base of the tower and in the same straight line with it are complementary . The height of the tower is 

If the height of a given cone be doubled and radius of base remains the same, the ratio of the volume of the given cone to that the second cone will be -

A shopkeeper by selling  13 Titan watches, earns a profit equal to the selling  price  of 3 Titan watches. His profit percentage is

Directions:  In the following two equations questions numbered (I) and (II) are given. You have to solve both equations and
Give answer
(a) If x > y
(b) If x ≥ y
(c) If y > x
(d) If y ≥ x
(e) If x = y or no relation can be established

$$ {I.x^{2}=81}$$
$$ {II.(y-9)^{2}}=0$$

The Banker's discount on a bill due 6 months hence at 16% per annum is ₹ 216. The true discount is: 

A certain sum doubles in 7 years at simple interest. The same sum under the same interest rate will become 4 times in how many years.:

In how many ways can letter of the word MAILINGS arrange so that M and N always come together? 

P, Q, R are employed to do a work for Rs. 5750. P and Q together finished 19/23 of work and Q and R together finished 8/23 of work. Wage of Q, in rupees, is-