Express the following as ratios in their simplest form:

$25$ litres to $50$ litres

Express the following as ratios in their simplest form.

$25 \mathrm{c}$ to $\$2.00$

Express the following as ratios in their simplest form:

$75 \mathrm{cm}$to $2 \mathrm{m}$ 

Express the following as ratios in their simplest form.

$600 \mathrm{g}$ to five kilograms

Express the following as ratios in their simplest form.

$15 \mathrm{mm}$ to a metre

Express the following as ratios in their simplest form.

$2.5 \mathrm{g} \mathrm{to} 50 \mathrm{g}$

Express the following as ratios in their simplest form.

$4 \mathrm{cm}$ to $25 \mathrm{mm}$

Express the following as ratios in their simplest form.

$400 \mathrm{ml}$ to $3 \mathrm{l}$

Find the unknown value in the following equivalent ratio.

$2:3=6:x$