$ 1390 was collected. How much was in $20 notes and how many in $50 notes in that order? How many solutions exists?

Correct result:

n =  3


1390=20x+50y x1=62,y1=3 x2=57,y2=5 x3=52,y3=7 n=31390=20x + 50y \ \\ x_{1}=62, y_{1}=3 \ \\ x_{2}=57, y_{2}=5 \ \\ x_{3}=52, y_{3}=7 \ \\ n=3

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