A number decreased by $27\frac{1}{2}\%$ gives $87$. The number is:

One-third of $1206$ is what percent of $134$?

$x\%$ of $y$ is $y\%$ of?

What percent of $\frac{2}{7}$ is $\frac{1}{35}$?

Express: $24\%$ as a fraction.

Express: $105\%$ as a decimal.

Express: $4:5$ as a percentage

Express: $56\%$ as a ratio.