A cash box of $1 and $5 is worth $165. The number of $5 bills is twice as much as $1 bills. How many of each bill does it contain? State both the unknown variable/expression for the two quAntities and the equation

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.