what is land?

A man sold 1/2 of his land. He gave 1/2 of the remaining portion to his son and 1/3 of the balance to his daughter. What fraction of his land left.

In the adjoining figure a dart is thrown at the dart board and lands in the interior of the circle . What is the probability that the dart will land in the shaded region.

In figure, a dart is thrown and lands in the interior of the circle. What is the probability that the dart will land in the shaded region ?

In figure, a dart is thrown and lands in the interior of the circle. What is the probability that the dart will land in rectangle ABCD region ?

In figure,a dart is thrown and lands n the interior of the circle.What is the probability that the dart will land in the shaded region?