5,5,2,2,2,3,1,10,10,x ⇒ 10 liczb 5+5+2+2+2+3+1+10+10+x= 40 +x
(40+x) ÷ 10 = 6 /×10
(40+x) = 6 ×10 /-40
x= 60 - 40
x= 20
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5,5,2,2,2,3,1,10,10,x ⇒ 10 liczb 5+5+2+2+2+3+1+10+10+x= 40 +x
(40+x) ÷ 10 = 6 /×10
(40+x) = 6 ×10 /-40
x= 60 - 40
x= 20