Question

Aflati patru nr stiind ca trei cate trei au media aritmetica:20,6(3);22,7(3);18,8 si 17,6(3)

Answer 1

a+ b + c = 20,63 x 3 = 61,90
a + b +d = 22,73 x 3 = 68,20
a +c + d = 18,8 x 3 = 56,40
b +c+d = 17,6 x 3 = 52,80=>
=>a + b + c + d = (61,90 + 68,20 + 56,40 + 52,80 ) : 3