At the end of the year 2016, the population of villages Kovad, Varud, Chikhali is 5x² – 3y², 7y² + 2xy and 9x² + 4xy respectively. At the beginning of the year 2017, x² + xy – y²,5xy and 3x² + xy persons from each of the three villages respectively went to another village for education then what is the remaining total population of these three villages?

Older Population of Kovad, Pk = 5x² – 3y²

Older Population of Varud, Pv = 7y² + 2xy

Older Population of Chikhali, Pc = 9x² + 4xy

Number of people migrated from Kovad, Mk = x² + xy – y²

Number of people migrated from Varud, Mv = 5xy

Number of people migrated from Chikhali, Mc = 3x² + xy

Present Population of Kovad = Pk – Mk

= (5x² – 3y²) – (x² + xy – y²)

= 4x² – 2y² – xy

Present population of Varud = Pv – Mv

= (7y² + 2xy) – 5xy

= 7y² – 3xy

Present Population of Chikhali = Pc – Mc

= (9x² + 4xy) – (3x² + xy)

= 6x² + 3xy