Sir I did not get solution for third set. please will you pls explain this condition

Number of people playing only hockey = Number of people playing only football.

Also as all and middle school educational people have primary school education and all high school educated people have middle school education, number of people in

Category I = 4x,

Category II = 2x, Category III = x.

(3x-2)/2 and ( 3x/2-2)/2=(3x-4)/4 respectively