The area of a rhombus is 144 square units. The length of one of its diagonals is twice the length of other diagonal. What is the sum of length of its diagonals?

Let ΔABC ∼ Δ PQR and ar(∆ABC)/ar(∆PQR) =4/25. If AB = 12 cm, BC = 8 cm and AC = 9 cm, then QR is equal to:

A four digit number is formed by writing a two digit number together twice like: 15:15, -3737 etc. A number of this form will be exactly divisible by which of the following numbers 

If a^2x+2=1, where a is a positive real number other than 1, then x is equal to 

If x is real then the minimum value of (x²-x-1) is :

A circular pavement was to be built around a square park of side 18 m. The maximum width of pavement is 5 m. Calculate the cost of cementing the pavement at Rs. 15 per m² .

Which of the following numbers is divisible by 11?

A furniture salesman increased the value of furniture by 20 percent due to the lure of more income, which led to a decrease of 30 percent in his sales, then tell him what percentage was reduced in his income?