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41 - 1 = 40
x - ilość dwuzłotówek
y - ilość pięciozłotówek
149zł = 2x + 5y
40 = x + y / -y
149 = 2x + 5y
x = 40 - y
149 = 2(40 - y) + 5y
x = 40 - y
149 = 80 - 2y + 5y
x = 40 - y
149 = 80 + 3y
x = 40 - y
149 = 80 + 3y / -80
x = 40 - y
69 = 3y / :3
x = 40 - y
y = 23
x = 40 - 23
y = 23
x = 17
x+y+1=41
x=40-y
1+80-2y+5y=150
3y=69
x=40-y
y=23
x=17
pięciozłotówek było 23 a dwuzłotówek 17