A sum of money at compound interest doubles itself in 15 years. It will become eight times of itself in

If 18 men can finish a job in 26 days, then, in how many days will 13 men finish the same job?

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

Two train 120 meters and 160 meters in length are running towards each other on parallel lines at the speed of 70 kmph and 42 kmph respectively. How long will it take to cross each other after they meet?

Directions: The following questions are accompanied by three statements (A) or (I), (B) or (II), and (C) or (III). You have to determine which statement(s) is/are sufficient/necessary to answer the questions.

What is the inradius of a right-angled triangle?
A. The area of the triangle is known.
B. Any two sides of the triangle are known.
C. The perimeter of the triangle is known.

If one of the equal angles of an isosceles triangle is 65°, then the angle at the vertex is

A person lent Rs. 8000 partly at the rate of 5% and partly at the rate of 6% per annum simple interest. The total interest after 2 years is Rs. 820 then in which ratio will Rs. 8000 is to be divided?

The total cost of x pens and (x-2) pencils is Rs 424. If one pencil and one pen costs Rs 4 and Rs 20 respectively then find x?