Question

the class of 50 students there are equal boys and girls the average weight of boys in the class is 32 kg and the average weight of girls in the class is 28 kg the average of boys girls and the class teacher is 31 kg find the weight of the class teacher​

Answer 1

Total students: 50

Boys = Girls = 25

Av of boys = 32 = Sum of all weight of boys\25 = x\25 = x = 800

Av of girls = 28 =  Sum of all weight of girls\25 = y\25 = y = 700

Av of whole class(Incl teacher) = 31 = x+y+Teacher\51 = 31

800+700+t = 31*51

t = 1581-1500

t = 81Kg

Weight of the class teacher = 81Kg