Jawabanmu

2014-09-12T21:35:05+07:00
Misal :
% B-10 = x % dan % B-11 = (100-x)%
Ar B = P1 x massa B-10 + p2 x massa B-11 / P1 + P2
10,81 = (x)(10) + (100-x)11 / x + (100-x)
10,81 = 10x + 1100 - 11x / 100
1081-1100 = 10x - 11x
x = 19
jadi % B-10 = 19% dan %B-11 = 81%