Saleswoman 2667

Martin bought goods in the store for 260 CZK. He paid with a thousand CZK crowns. The saleswoman returned 18 banknotes and coins worth CZK 10 and CZK 50. How many of each value were there?

Correct answer:

a =  4
b =  14

Step-by-step explanation:

a+b=18 10a+50b=1000260  a+b=18 10 a+50 b=1000260  a+b=18 10a+50b=740  Pivot:Row1Row2 10a+50b=740 a+b=18  Row2101 Row1Row2 10a+50b=740 4b=56  b=456=14 a=1074050b=1074050 14=4  a=4 b=14

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