How many different ways can the cashier pay out € 310 if he uses only 50 and 20 euro banknotes? Find all solutions.

Correct answer:

n =  3

Step-by-step explanation:

310 = 50a + 20b 310=2531 50=252 20=225 GCD(310,50,20)=25=10  d=GCD(310,50,20)=10  31 = 5a + 2b  a1=1, b1=13 a2=3, b2=8 a3=5, b3=3  n=3

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