Purchase goods from suman Rs 100000 by payment made by cash Rs 40000 only

Adrawer contains 12 identical white socks, 18 identical black socks and 14 identical brown socks. what is the least number of socks you must choose, without looking, to be certain that you have chosen two socks of the same colour?

What is the solution set of the quadratic inequality x^2-5< or equal to 0

Having a hard time understanding this question (see attachment).