The pie-chart below shows, in terms of the central angles of the sectors representing each group, the distribution of number of boys in six classes of a school in a village.

If 40% of the students studying in 3^rd class like to play hockey, then the number of students studying in 3rd class who do NOT like to play hockey is:

180

60% = \(\frac{3}{5}\)

Number of students who do not like hockey = \(\frac{3}{5}\) ×  \(\frac{60}{360}\) × 1800

= \(\frac{3}{5}\) ×  300

= 180