Banknotes 62164

Lucas saved 120 banknotes. They were 5 and 10 euro banknotes. He found that he had saved € 820. How many banknotes were there?

Correct answer:

a =  76
b =  44

Step-by-step explanation:

a+b=120 5 a+10 b=820  a+b=120 5a+10b=820  Pivot:Row1Row2 5a+10b=820 a+b=120  Row251 Row1Row2 5a+10b=820 b=44  b=144=44 a=582010b=582010 44=76  a=76 b=44

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