Bonsoir;
(1+ 7+ 11+ 19+ 30+x)/6 = 3x
(68+x)/6 = 3x
688+x = 3x*6
68+x = 18x
68 = 18x-x
688=17x
x = 68/17
x = 4
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Bonsoir;
(1+ 7+ 11+ 19+ 30+x)/6 = 3x
(68+x)/6 = 3x
688+x = 3x*6
68+x = 18x
68 = 18x-x
688=17x
x = 68/17
x = 4