The weight of $84$ identical books is $12 \mathrm{kg}$ and the weight of $35$ such books in $x \mathrm{kg}$, then find the value of $x$.

As per a recipe book, $3 \mathrm{kg}$ sugar is required with $5 \mathrm{kg}$ mangoes to make mango jam. How much sugar would Ritu need if she wants to make a jam with $3 \mathrm{kg}$ mangoes$?$

A ratio equivalent to $2:5$ is

The ratio $36:84$ in its simplest form is :