A vase of flowers contains $5$ pink ones, $3$ red ones and  $7$ white ones. What fraction of the flowers in the vase are red?

A vase of flowers contains $5$ pink ones, $3$ red ones and  $7$ white ones. What fraction of the flowers in the vase are pink?

Express $\frac{35}{8}$ as mixed number

If $\frac{3}{5}=\frac{k}{20}$, then the value of $k$ is _____.