Аня,Валя и Галя варили варенье,всего девочки сварили 20 л.Оказалось,что Валя и Галя сварили одинаковое количество варенья,а Валя и Аня вместе сварили в полтора раза больше варенья,чем Галя.Сколько литров варенья сварила Галя?

Let's assume the amount of jam Galya made is "x" liters.

According to the information given, Valya and Galya together made 1.5 times more jam than Galya. Therefore, Valya and Anya made 1.5x liters of jam.

Also, Valya and Galya made the same amount of jam, which means they both made x liters.

So, the total amount of jam made by all three girls is x + x + 1.5x = 20 liters.

Simplifying the equation, we get 3.5x = 20.

Dividing both sides by 3.5, we find that x = 20 / 3.5 = 5.71 (approximately).

Therefore, Galya made approximately 5.71 liters of jam.