 
 <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. <hau> Kungiyar 'yan mata ce kashi 60 cikin 100 saboda 100 - 40 = 60. Matsakaicin aji shine 86% saboda.4 ((80) +.6 ((90) = 86. Amsar ita ce 86. 