Respuesta :
24 becuase add the two together then divide by two
1st let's calculate the sum from 1 to 35:
it's an arithmetic progression with first term a = 11, last term = 35 and the number of term n = 25
s= (11+35)25/2 = 575
Average = 575/25 = 23
it's an arithmetic progression with first term a = 11, last term = 35 and the number of term n = 25
s= (11+35)25/2 = 575
Average = 575/25 = 23