Answer :

Older Population of Kovad, Pk = 5x^{2} – 3y^{2}

Older Population of Varud, Pv = 7y^{2} + 2xy

Older Population of Chikhali, Pc = 9x^{2} + 4xy

Number of people migrated from Kovad, Mk = x^{2} + xy – y^{2}

Number of people migrated from Varud, Mv = 5xy

Number of people migrated from Chikhali, Mc = 3x^{2} + xy

Present Population of Kovad = Pk – Mk

= (5x^{2} – 3y^{2}) – (x^{2} + xy – y^{2})

= 4x^{2} – 2y^{2} – xy

Present population of Varud = Pv – Mv

= (7y^{2} + 2xy) – 5xy

= 7y^{2} – 3xy

Present Population of Chikhali = Pc – Mc

= (9x^{2} + 4xy) – (3x^{2} + xy)

= 6x^{2} + 3xy

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