What is the enlargement factor? What is the length of x? Think of a number and call it y, then multiply by y and divide by x. Write the expression of the statement. What is the volume of the cylinder be

The problem states to "Think of a number and call it $y$". So, we begin with $y$.

The problem then says to "multiply by 4". Multiplying $y$ by 4 gives $4y$.

Next, the problem says to "divide by $x$". Dividing the current expression ($4y$) by $x$ gives $\frac{4y}{x}$.

The expression of the statement is $\frac{4y}{x}$.