The Ferris Wheel at the school fair has radius of 10 metres. It revolves at the rate of one revolution per 2 minutes. How many seconds does it take a rider to travel from the bottom of the wheel to a point 5 vertical metres above the bottom?

Given a circle, a circumscribed square is one that completely encloses the circle, and an inscribed square is completely enclosed by the circle, as shown below

If the the difference in the areas of the two squares is 49 sq. m., then what is the area of the circle in sq. m.? Assume π =

From a point in the interior of an equilateral triangle, perpendiculars are drawn on the three sides. The lengths of the perpendiculars are 6 cm, 7 cm and 5 cm. Find the area of the triangle.

There are two solution of acid S_{1} and S_{2}, such that S_{1} contains 60% acid whole S_{2} contains 50% acid. What quantities of S_{1} and S_{2} should me mixed to get 10 liters of solution that contains 57% acid.

In an exam with two subjects, 65% passed the first subject, and 70% passed the second subject. 10% failed in both the subjects. If 387 passed in both subjects, then how many wrote the exam?