Write the following statement as an equation:
A number (call it $n$n) minus one equals three.
Write the following statement as an equation:
A number (call it $n$n) plus eight equals fifteen.
Write the following statement as an equation:
A number (call it $n$n) multiplied by five gives you twenty.
Write the following statement as an equation:
A number (call it $n$n) is divided by three to give two.