Czerwonych: 21
Białych: 3 + x
Razem: 3 + x + 21
(3 + x) / (3 + x + 21) = 3 / 10
(mnożywmy na krzyż)
10(3 + x) = 3(3 + x + 21)
30 + 10x = 9 + 3x + 63
7x = 9 + 63 -30
7x = 42
x = 6
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Czerwonych: 21
Białych: 3 + x
Razem: 3 + x + 21
(3 + x) / (3 + x + 21) = 3 / 10
(mnożywmy na krzyż)
10(3 + x) = 3(3 + x + 21)
30 + 10x = 9 + 3x + 63
7x = 9 + 63 -30
7x = 42
x = 6