Participants 81059

Participants paid out 3,300 euros in 40 banknotes. Some were 50e, and others were 100e. How many were there?

Correct answer:

a =  14
b =  26

Step-by-step explanation:

a+b=40 50a+100b=3300  a+b=40 50 a+100 b=3300  a+b=40 50a+100b=3300  Pivot:Row1Row2 50a+100b=3300 a+b=40  Row2501 Row1Row2 50a+100b=3300 b=26  b=126=26 a=503300100b=503300100 26=14  a=14 b=26

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