Question

Which of the following is not in the lowest form?

• A. $\frac{7}{5}$
• B. $\frac{15}{20}$
• C. $\frac{13}{33}$
• D. $\frac{27}{28}$

Answer 1

The correct option is B $\frac{15}{20}$

In case of $\frac{5}{7}$, the common factor of $7$ and $5$ is $1$.
Hence, already given in the simplest form.
In case of $\frac{15}{20}$, the common factor of 15 and 20 is 4.
In case of $\frac{13}{33}$, the common factor of 13 and 33 is 1.
Hence, already given in the simplest form.
In case of $\frac{27}{28},$ the common factor of 27 and 28 is 1.
Hence, already given in the simplest form.
Hence, $\frac{15}{20}$ not given in the simplest form.