How many halves are there in two wholes?

How many eighths are there in two wholes?

How many sixths are there in three wholes?

Express the fraction in its simplest form

$\frac{315}{420}$

$\frac{154}{198}$ in the simplest form is $\frac{7}{A}$. Write the value of $A$ in the answer box.

Express the fraction in its simplest form

$\frac{168}{240}$

Find the simplest form of $\frac{320}{480}$ in the form of fraction.