1. In the country of Nedoijdia, along with other banknotes, there are banknotes of 15 and 20 denars. Vendi went shopping and had only banknotes of 15 and 20 denars. She spent half of her money on a meal, which she paid for with exactly two banknotes, and half of the remaining money she spent in the butcher's shop, where she gave exactly three banknotes. How much money did Vendi have when she left home?
Solution. For the meal, Wendy spent 2 banknotes, i.e., 30 denars or 45 denars or 60 denars, which is half of all her money. According to the condition of the problem, for the remaining daily needs, she gave twice as much money, i.e., 60 denars or 90 denars or 120 denars. This amount was paid with 3 banknotes, so it cannot be more than 60 denars. Therefore, Wendy spent a total of $30+60=90$ denars, which is three fifths of 150 denars.

Finally, when Wendy left home, she had 150 denars.