Answer:
![\huge\boxed{5}](https://img.qammunity.org/2021/formulas/mathematics/high-school/6ojbnuhal502w8ixlmeo64hompq2xe3xg6.png)
Explanation:
Luis has 30 problems and after one hour,
of those problems are left. This means that the total number of problems left will be
.
Multiplying by a fraction is the same as dividing by a whole. The denominator of
is 6, so we can divide 30 by 6.
![30 / 6 = 5](https://img.qammunity.org/2021/formulas/mathematics/college/vfmzvahab2ti2sblpcvc72v4wrfqixmwz1.png)
Hope this helped!