Question

A rate simplified so that it has a denominator of 1?

Answer 1

$\sf\frac{28}{7} = \frac{7\times 4}{7\times 1}=\frac{4}{1}\\\\\frac{28}{7} ~is ~a ~rate~ that~ when~ simplified ~has ~1~ in~ the ~denominator.$

Answer 2

6/3 is a rate that when simplified is 2/1 and it has a denominator of 1.