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x- banknoty 100 zł
y- banknoty 20 zł
x+y=27
100x+20y=1420
x=27-y
100*(27-y)+20y=1420
x=27-y
2700-100y+20y=1420
x=27-y
-80y=1420-2700
x=27-y
-80y=-1280 /*(-1)
x=27-y
80y=1280
x=27-y
y=16
x=11
y=16
Banknotów o nominale 100 zł było 11 szt , a o nominale 20 zł było 16 szt
y=banknoty 20 zlotowe
100x+20y=1420
x+y=27
100x+20y=1420
x=27-y
2700-100y+20y=1420
x=27-y
-80y=-1280
y=16
x=11
b = liczba banknotów 20 zł
{a*100 + b*20=1420
{a+b=27
a=27-b
a*100 + b*20 = 1420
(27-b)*100 + b*20 = 1420
2700-100b +20b = 1420
-80b = 1420 -2700
-80b = -1280 | :(-80)
b = 16
a = 27-b
a = 27-16
a = 11
b = 16