One and a half times that of vegetable fields and rice fields is 39 hectares.
Half of paddy fields and 1/3 vegetable fields add up to 12 hectares.
Two thirds of paddy fields and vegetable fields add up to 24 hectares.
39-24= 15 hectares, that is, 1.5-2/3=5/6 vegetable fields.
Vegetable field = (39-24) ÷ (1.5-2/3) =18 hectares.
Paddy field = (13-18 ÷ 2) ÷1/3 =12 hectares.