This math problem examines students' knowledge of division within 100. It is known that a catty of watermelon needs 3 yuan money, and there is 100 yuan in hand. Divide 3 by 100 and finally work out a circulating decimal of 33.3, so 100 yuan can buy about 33.3 kilograms of watermelon.
Watermelon annual vine; Stems and branches are stout with obvious edges. Tendrils stout, pubescent, petiole thick and densely pilose; The leaf blade is papery, triangular, oval in outline, white and green in color, with short bristles on both sides and heart-shaped at the base of the leaf blade.