Management Aptitude Test 2017 Paper

(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 × $\frac{80}{100}=\frac{720\mathit{x}}{100}$
In locality B, number of literate people
= 8x × $\frac{70}{100}=\frac{560\mathit{x}}{100}$
In locality C, number of literate people ,
= 3x × $\frac{90}{100}=\frac{270\mathit{x}}{100}$
Total population of the town = 9x + 8 x + 3x = 20x
Percentage literacy in the town
= $\frac{\left[\frac{720\mathit{x}}{100}+\frac{560\mathit{x}}{100}+\frac{270\mathit{x}}{100}\right]}{20\mathit{x}}$ × 100
= $\frac{1550\mathit{x}}{20\mathit{x}}$= 77.5%