If length $\left(l\right)$ of a rectangle is $2$ $\mathrm{cm}$ less than twice its breadth $\left(b\right)$. Find the expression for the length of the rectangle. Find the perimeter $\left(P\right)$ of the rectangle when $b=5$ $\mathrm{cm}$.

Shalini had guests coming to her party. She decides to serve a Gulab jamun as sweet dish to each guest. She already has $12$ Gulab jamuns. If she buys $x$ Gulab jamuns more, how many guests are coming to her place?

You have $t$ toffees in your bag. Your sister has $4$ times as many toffees as you do. How many toffees does your sister have$?$