Verča would like to go swimming, but she dislikes going into the water without eating. She has an average density of 945 kg·m⁻³ when she is hungry, and it is hard for her to dive. How many kilograms of food does Verča need to eat to have an average density of at least 980 kg·m⁻³? Assume that she does not change her volume when she eats. The length of the pool is 30 m and its depth is 3.1 m. Verča's weight before the meal is 47 kg.
Verča sometimes feels very empty inside.