If x - y = 6 and xy = 40, then find x2 + y2 ?

If 3x - 8(2 - x) = -19, then the value of x is

The area of a circle is 616 sq cm, find its circumference?

A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 4 days. How long B alone would take to do the whole work?

Find the sum of interior angles of a dodecagon?

The line passing through (-2,5) and (6,b) is perpendicular to the line 20x + 5y = 3. Find b?

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

Two cars travel from city A to city B at a speed of 36 and 48 km/hr respectively. If one car takes 3 hours lesser time than the other car for the journey, then the distance between City A and City B is