mean of 6 numbers is 41 means
(x+y+z+t+a+b)/6=41
(x+5morenumbers)/6=41
if 1 is removed (say x)
mean iof 5 numbers is 46
(5morenumbers)/5=46
multiply first equaiton by 6 and second eqiaton by 5 to clear fractions
x+5morenumbers=246
5morenumbers=230
sub 230 for 5morenumbers in first equaiton
x+230=246
minus 230 both sides
x=16
the unknown is 16