Banknotes 83131

Cashier Samuel had a total of 20 banknotes in the cash register with a total value of 850 euros. They were only €50 and €20 notes. How many of each bill did he have?

Correct answer:

a =  15
b =  5

Step-by-step explanation:

a+b=20 50a+20b=850  a+b=20 50 a+20 b=850  a+b=20 50a+20b=850  Pivot:Row1Row2 50a+20b=850 a+b=20  Row2501 Row1Row2 50a+20b=850 0.6b=3  b=0.63=5 a=5085020b=5085020 5=15  a=15 b=5

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