В1 + В2 = 5
(В1 + В2 + В3) / 3 = 5
(5 + В3) / 3 = 5
5 + В3 = 15
В3 = 15 – 5 = 10
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В1 + В2 = 5
(В1 + В2 + В3) / 3 = 5
(5 + В3) / 3 = 5
5 + В3 = 15
В3 = 15 – 5 = 10