Verified answer

пусть числа будут от x₁ до x₁₀

тогда

(x₁+x₂+x₃+x₄+x₅+x₆+x₇)/7 = 10.2

x₁+x₂+x₃+x₄+x₅+x₆+x₇ = 10.2*7 = 71.4

(x₈+x₉+x₁₀)/3 = 6.8

x₈+x₉+x₁₀ = 6.8*3 = 20.4

x₁+x₂+x₃+x₄+x₅+x₆+x₇+x₈+x₉+x₁₀ = 20.4 + 71.4 = 91.8

(x₁+x₂+x₃+x₄+x₅+x₆+x₇+x₈+x₉+x₁₀)/10  = 91.8/10 = 9.18

ответ 9,18