Calculation 4718

The bank has a total of CZK 1,390 in 50 banknotes. How many banknotes are worth CZK 20 and CZK 50? Please follow the calculation procedure. Thank you

Correct answer:

a =  37
b =  13

Step-by-step explanation:


a+b = 50
20a + 50b = 1390

a+b = 50
20·a + 50·b = 1390

a+b = 50
20a+50b = 1390

Pivot: Row 1 ↔ Row 2
20a+50b = 1390
a+b = 50

Row 2 - 1/20 · Row 1 → Row 2
20a+50b = 1390
-1.5b = -19.5


b = -19.5/-1.5 = 13
a = 1390-50b/20 = 1390-50 · 13/20 = 37

a = 37
b = 13

Our linear equations calculator calculates it.



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