Find the lowest common denominator for the fractions $\frac{4}{5}$45 and $\frac{2}{15}$215.
Find the lowest common denominator for the fractions $\frac{4}{5}$45 and $\frac{2}{7}$27.
Find the lowest common denominator for the fractions $\frac{31}{35}$3135 and $\frac{1}{49}$149.
Find the lowest common denominator of $\frac{5}{21}$521 and $\frac{9}{35}$935.