 
 <translate> The class is 60% girls because 100 - 40 = 60. The class average is 86% because .4(80) + .6(90) = 86. So the answer is 86. <ibo> Pasent 60 nke klas ahụ bụ ụmụ agbọghọ n'ihi na 100 - 40 = 60. Nkezi klas bụ 86% n'ihi na.4(80) +.6(90) = 86. Ya mere azịza ya bụ 86. 