Show that the height of a closed right circular cylinder of given surface and maximum volume, is equal to the diameter of its base.
let r and h be the radius and height of the cylinder. Then,
Hence, the volume is maximum if its height is equal to its diameter.
How many times must a man toss a fair coin, so that the probability of having at least one head is more than 80%?
A manufacturer produces nuts and bolts. It takes 1 hours of work on machine A and 3 hours on machine B to product a package of nuts. It takes 3 hours on machine A and 1 hour on machine B to produce a package of bolts. He earns a profit of `17.50 per package on nuts and `7 per package of bolts. How many packages of each should be produced each day so as to maximize his profits if he operates his machines for at the most 12 hours a day? From the above as a linear programming problem and solve it graphically.