The Teeth of the Hydra
The Hydra has 7 heads to start. Jason cuts off 13. For each one cut off, the Hydra gets it back plus 1. You could draw a diagram to simulate the battle. Once you find out how many heads the Hydra had when it was slain, add the 13 on the ground to that number. Multiply this answer by 24 then by 7 to get thetotal number of skeleton warriors.