In a competitive exam of $100$ questions, Harsh attempts $80$ questions. Each correct answer is equal to $2$ marks and there is a negative marking of $1$ marks for each wrong answer. If harsh attempts $50$ right answers out of his total attempt, then how much will he score?

In a badminton match of three rounds, Rishu scored $\frac{1}{3}$ of the total points in the first round, $2\frac{2}{5}$ of total points in the second round and $3\frac{1}{7}$ of total points in the third round. What fraction of total points did Rishu score in all three rounds?

Area of rectangle is $4\frac{1}{3} m^2$. If the length is $\frac{2}{9} m$, then determine its breadth.

In a bucket of $87$oranges, $\frac{1}{3}$ are spoiled ones and remaining are eaten by the members of a family. How many oranges are eaten by the members of family?