(d) None of these
Let, the population of the localities of A, B and C be 9x, 8x and 3x, respectively.
In locality A, number of literate people
= 9x ×
= In locality B, number of literate people
= 8x ×
= In locality C, number of literate people ,
= 3x ×
= Total population of the town = 9x + 8 x + 3x = 20x
Percentage literacy in the town
=
× 100
=
= 77.5%